Planetary Science Research Discoveries

Planetary scientists sharing ideas and discoveries.

Planetary Science Research Discoveries (PSRD) is an educational site sharing the latest research by NASA-sponsored scientists on meteorites, asteroids, planets, moons, and other materials in our Solar System. The website is supported by the Cosmochemistry Program of NASA's Science Mission Directorate and by Hawai'i Space Grant Consortium and is a vital link for planetary and space sciences, and for learning how science works.

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Archive of Meteorite Articles

Articles listed by publication date.

DATE POSTED

HEADLINE ARTICLES

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NOV 2014 Asteroids—Watching the Sky—Searching for Meteorites
by Linda M. V. Martel
CosmoSparks Report - NASA's Near-Earth Object observation program released a new global map of meteor strikes plus ANSMET begins a new season of searching for meteorites in Antarctica.
pdf link, meteor map plus meteorites
OCT 2014 Presolar Graphite Grain Isolated from a Carbonaceous Chondrite
by Linda M. V. Martel
CosmoSparks Report - Isotopic and microstructural investigations of a unique low-density supernova graphite grain.
pdf link, Presolar graphite grain
23 JUNE 2014 The Importance of When
by G. J. Taylor
Isotopic analyses at the microscopic scale indicate an ancient age for an impact mixture from Mars and appear to confirm a young age for a group of basaltic lava flows.
pdf link, Mars, The Importance of When
APRIL 2014 Investigating Q and Noble Gases in Meteorites
by Linda M. V. Martel
CosmoSparks Report - Nano-scale analyses on a carbon-rich, acid-resistant residue of the Saratov (L4) meteorite.
pdf link, Q and noble gases in meteorites
FEB 2014 ANSMET 2013-2014 field Season in the Miller Range, Antarctica
by Linda M. V. Martel
CosmoSparks Report - 333 meteorites collected for scientific study.
pdf link, ANSMET 2013-2014 Field Season Yields New Meteorite Samples
FEB 2014 Presolar Oxide Grains: A Study of Spinels
by Linda M. V. Martel
CosmoSparks Report - Measurements of elemental and isotopic compositions and microstructural properties of presolar grains from primitive meteorites.
pdf link, presolar spinel grains
NOV 2013 World Notice: 10,000 Near-Earth Objects and Details About One That Landed in Russia
by Linda M. V. Martel
CosmoSparks Report - International space agencies, observatories, and the United Nations plan to coordinate NEO efforts.
pdf link, Near-Earth Objects
16 SEPT 2013 Discovery of a New Garnet Mineral, Hutcheonite, in the Allende Meteorite
by Linda M. V. Martel
A new titanium-rich garnet mineral discovered in a CAI in Allende is named in honor of Ian D. Hutcheon.
pdf link, New Mineral Hutcheonite in Allende
SEPT 2013 The Organics in Sutter's Mill Meteorite
by Linda M. V. Martel
CosmoSparks Report - Soluble and insoluble organic materials in a recently fallen CM chondrite&Mdash;what they possibly mean to the development of prebiotic organics on the early Earth.
pdf link, Sutter's Mill Organics
JULY 2013 Dmisteinbergite: Refractory Mineral in Allende FUN CAI
by Linda M. V. Martel
CosmoSparks Report - Hexagonal CaAl2Si2O8 likely crystallized from a silicate melt at high temperature by rapid cooling.
pdf link, dmisteinbergite
30 MAY 2013 Magnesium-rich Basalts on Mercury
by Linda M. V. Martel
Crystallization modeling using the MELTS computer code with MESSENGER-derived compositions finds Mg-rich lavas on Mercury.
pdf link, Magnesium-rich Basalts on Mercury
30 APRIL 2013 Meteoritic Minerals Tell a Story of Multistage Cooling, Break-up, and Reassembly of an Asteroid
by G. Jeffrey Taylor
Compositional variations in minerals in H-chondrites indicate at least two vastly different cooling rates at different temperatures, suggesting fragmentation, cooling of the fragments, and reassembly into a second-generation rubble pile.
pdf link, Meteoritic Minerals Tell a Story of Multistage Cooling, Break-up, and Reassembly of an Asteroid
FEB 2013 The Surprise Meteorite Fall in Russia, February, 2013
by Linda M. V. Martel
CosmoSparks Report - The meteoroid, meteor, and ordinary chondrite in the news.
pdf link, Chelyabinsk
FEB 2013 ANSMET 2012-2013 Field Season Yields New Meteorite Samples
by Linda M. V. Martel
CosmoSparks Report - Hundreds of new specimens will be available for research.
pdf link, ANSMET 2012-2013 Field Season Yields New Meteorite Samples
FEB 2013 Meteoritics & Planetary Science—Special Issue
by Linda M. V. Martel
CosmoSparks Report - Articles in the December 2012 issue cover cosmochemical research presented at the 2011 Workshop on Formation of the First Solids in the Solar System.
pdf link, Meteoritics & Planetary Science--Special Issue
JAN 2013 Chondrule Formation
by Linda M. V. Martel
CosmoSparks Report - Data from oxygen-isotopic conpositions and oxidation states of chondrule olivines in CR chondrites.
pdf link, Chondrule Formation
30 JAN 2013 New Martian Meteorite is Similar to Typical Martian Crust
by G. Jeffrey Taylor
A newly-identified Martian meteorite from Northwest Africa is not like other Martian meteorites, but has a chemical composition similar to the average Martian crust.
pdf link, New Martian Meteorite is Similar to Typical Martian Crust
10 DEC 2012 Zinc Isotopes Provide Clues to Volatile Loss During Moon Formation
by G. Jeffrey Taylor
Ratios of zinc isotopes indicate evaporation of zinc (and other volatiles) during formation of the Moon. Includes new zinc isotopic data for Martian meteorites.
pdf link, Zinc Isotopes Provide Clues to Volatile Loss During Moon Formation
16 NOV 2012 Dating Transient Heating Events in the Solar Protoplanetary Disk
by G. Jeffrey Taylor
Startlingly precise dating of components in primitive meteorites indicate contemporaneous formation of calcium-aluminum-rich inclusions (CAIs) and chondrules.
pdf link, Dating Transient Heating Events in the Solar Protoplanetary Disk
26 OCT 2012 Exploring the Mantle of Mars
by G. Jeffrey Taylor and Linda M. V. Martel
Cosmochemistry and geophysics experts meet to discuss what we know and do not yet know about the composition, structure, and evolution of the Martian mantle.
pdf link, Exploring the Mantle of Mars
OCT 2012 Discovery of Native Mercury and Mercury Sulfide in Tieschitz Meteorite
by Linda M. V. Martel
CosmoSparks Report - Microbeads of native Hg indicate cold accretion.
pdf link, Discovery of Native Mercury and Mercury Sulfide in Tieschitz Meteorite
31 JULY 2012 How Much Water is Inside Mars?
by G. Jeffrey Taylor
The interior of Mars appears to be as wet as the interior of Earth.
pdf link, How Much Water is Inside Mars?
JULY 2012 Water, Carbonaceous Chondrites, and Earth
by Linda M. V. Martel
CosmoSparks Report - The drive continues to understand all the possible sources of Earth's water.
pdf link, Water, Carbonaceous Chondrites, and Earth
JUNE 2012 Olympic-caliber Mineral Finder
by Linda M. V. Martel
CosmoSparks Report - A new mineral, panguite, formed during the birth of our Solar System has been found in the Allende meteorite.
pdf link, Olympic-caliber Mineral Finder
MAY 2012 Space Station Crew Answers Question about Micrometeorites
by Linda M. V. Martel
CosmoSparks Report - On the day Space Station astronauts opened the hatch and entered the SpaceX Dragon capsule for the first time, PSRD asked: how does micrometeorite bombardment affect spacecraft?
pdf link, Space Station Crew Answers Question about Micrometeorites
APRIL 2012 Why the Definition of Crystal Changed
by Linda M. V. Martel
CosmoSparks Report - The discovery of quasicrystals revolutionized the science of crystal chemistry, and one of them shows evidence of an extraterrestrial origin.
pdf link, Why the Definition of Crystal Changed
FEB 2012 ANSMET 2011-2012 Field Season in the Miller Range, Antarctica
by Linda M. V. Martel
CosmoSparks Report - 302 meteorites collected for scientific study.
pdf link ANSMET 2011-2012 Field Season in the Miller Range, Antarctica
JAN 2012 A Summer Fall
by Linda M. V. Martel
CosmoSparks Report - Martian meteorite, Tissint, fell in Morocco in July, 2011.
pdf link, A Summer Fall
JAN 2012 Soluble Organics of the Bells Meteorite
by Linda M. V. Martel
CosmoSparks Report - An inventory of prebiotic, soluble organic compounds in an anomalous CM chondrite.
pdf link, Soluble Organics of the Bells Meteorite
15 DEC 2011 Formation of Carbonate Minerals in Martian Meteorite ALH 84001 from Cool Water Near the Surface of Mars
by G. Jeffrey Taylor
A new approach to thermometry using isotopic compositions of carbon and oxygen indicates that carbonate minerals in Martian meteorite ALH 84001 formed at 18 ± 4 oC.
pdf link, Formation of Carbonate Minerals in ALH 84001
30 NOV 2011 Festival on the Formation of the First Solids in the Solar System
by G. Jeffrey Taylor and Linda M. V. Martel
Cosmochemists, astronomers, and astrophysical modelers shared data and ideas about the formation of the materials making up the Solar System.
pdf link, Formation of the First Solids
22 JUNE 2011 A Traveling CAI
by G. Jeffrey Taylor
Oxygen isotopes show that a calcium-aluminum-rich inclusion wandered throughout the inner Solar System before being incorporated into an asteroid.
pdf link, A Traveling CAI
JUNE 2011 Looking After and Preserving NASA's Extraterrestrial Samples
by Linda M. V. Martel
CosmoSparks Report - The work of NASA's Astromaterials Acquisition and Curation Office.
pdf link, Looking After and Preserving NASA's Extraterrestrial Samples
JUNE 2011 A Meteorite with Up and Down Markers
by Linda M. V. Martel
CosmoSparks Report - Metal-sulfide nodules and vesicles aligned in asteroid's gravitational field.
pdf link, A Meteorite with Up and Down Markers
MAY 2011 Discovery of New Mineral, Krotite, in a CAI
by Linda M. V. Martel
CosmoSparks Report - CaAl2O4 named after Alexander N. Krot.
pdf link, Discovery of New Mineral, Krotite, in a CAI
7 APRIL 2011 Wet, Carbonaceous Asteroids: Altering Minerals, Changing Amino Acids
by G. Jeffrey Taylor
Aqueous alteration in asteroids containing organic compounds leads to formation of hydrous minerals and changes in the mix of amino acids.
pdf link, Wet, Carbonaceous Asteroids: Altering Minerals, Changing Amino Acids
DEC 2010 Asteroid Tracked -- Meteorites Found!
by Linda M. V. Martel
CosmoSparks Report - The unfolding story of meteorite Almahata Sitta.
pdf link, Asteroid Tracked--Meteorites Found!
30 NOV 2010 Supernova Confetti in Meteorites
by G. Jeffrey Taylor
Pre-solar grains carrying anomalous chromium-54 show evidence for formation in a supernova.
pdf link, Supernova Confetti in Meteorites
30 SEPT 2010 Unraveling the Origin of the Lunar Highlands Crust
by Linda M. V. Martel
Lunar meteorites contain clasts that may plausibly be samples of post-magma-ocean plutons that helped build the highlands crust.
pdf link, Unraveling the Origin of the Lunar Highlands Crust
1 JULY 2010 Damp Moon Rising
by G. Jeffrey Taylor
Cosmochemists find more evidence for water inside the Moon, showing that it is not the bone-dry place we thought.
pdf link, Damp Moon Rising
10 JUNE 2010 Formation of Stony-Iron Meteorites in Early Giant Impacts
by Edward Scott, Joseph Goldstein, and Jijin Yang
Cosmochemical studies and dynamical models of hit-and-run planetary collisions suggest a new origin for the stony-iron meteorites called pallasites.
pdf link, Formation of Stony-Iron Meteorites in Early Giant Impacts
21 MAY 2010 A Younger Age for the Oldest Martian Meteorite
by G. Jeffrey Taylor
New isotopic analyses show that famous Martian meteorite ALH 84001 formed 4.09 billion years ago, not 4.50 billion years ago as originally reported.
pdf link, A Younger Age for the Oldest Martian Meteorite
30 APRIL 2010 Asteroid, Meteor, Meteorite
by Linda M. V. Martel
Detected in space less than a day before hitting Earth, the Almahata Sitta meteorite from asteroid 2008 TC3 gives clues to the complex evolution of small asteroids.
pdf link, Asteroid, Meteor, Meteorite
21 JAN 2010 A Complication in Determining the Precise Age of the Solar System
by Gregory A. Brennecka
The presence of short-lived isotope Curium-247 in the early Solar System complicates the job of dating the earliest events in the solar nebula.
pdf link, A Complication in Determining the Precise Age of the Solar System
13 NOV 09 An Even More Precise View of Aluminum-26 in the Solar Nebula
by G. Jeffrey Taylor
New, precise analyses of the short-lived isotope aluminum-26 indicate it was distributed uniformly throughout the early solar system, an important clue to its origin.
pdf link, An Even More Precise View of Aluminum-26 in the Solar Nebula
26 OCT 09 Kaidun--A Meteorite with Everything but the Kitchen Sink
by Linda M. V. Martel
This unique breccia is called a single-stone meteorite collection.
pdf link, Kaidun Meteorite
18 SEPT 09 The Growing Diversity of Lunar Basalts
by G. Jeffrey Taylor
A lunar basaltic meteorite adds complexity to the already complicated story of mare basalt volcanism on the Moon.
pdf link, The Growing Diversity of Lunar Basalts
6 JULY 09 Better Know A Meteorite Collection: Natural History Museum in London, United Kingdom
by Linda M. V. Martel
PSRD highlights places and people around the world who play central roles in caring for and analyzing meteorites.
pdf link, Natural History Museum in London
25 JUNE 09 The Complicated Geologic History of Asteroid 4 Vesta
by G. Jeffrey Taylor
Meteorites from asteroid 4 Vesta show that it contains patches of granite-like rock.
pdf link, The Complicated Geologic History of Asteroid 4 Vesta
11 MAY 09 Better Know A Meteorite Collection: Natural History Museum in Vienna, Austria
by Linda M. V. Martel
PSRD highlights places and people around the world who play central roles in caring for and analyzing meteorites.
pdf link, Natural History Museum in Vienna, Austria
8 MAY 09 Mars Crust: Made of Basalt
by G. Jeffrey Taylor
Chemical analyses of rocks on the Martian surface indicate that the Martian crust was built of basalt lava flows not much different from those on Earth.
pdf link, Mars Crust: Made of Basalt
19 FEB 09 More Evidence for Multiple Meteorite Magmas
by G. Jeffrey Taylor
Cosmochemists show that a pair of meteorites formed in an asteroid that erupted a newly-recognized type of asteroidal magma.
pdf link, More Evidence for Multiple Meteorite Magmas
20 NOV 08 Tiny Molten Droplets, Dusty Clouds, and Planet Formation
by G. Jeffrey Taylor
Roughly constant sodium concentration during chondrule crystallization suggests that these molten droplets formed in regions of the solar nebula that were enriched in rocky dust.
pdf link, Tiny Molten Droplets, Dusty Clouds, and Planet Formation
8 JULY 08 Heating, Cooling, and Cratering: One Asteroid's Complicated Story
by G. Jeffrey Taylor
Cooling rate data indicate that the H-chondrite parent asteroid was deeply cratered as it cooled slowly.
pdf link, Heating, Cooling, and Cratering: One Asteroid's Complicated Story
30 MAY 08 Meteorites Found on Mars
by Linda M. V. Martel
No surprise that there are meteorites on other planets. Now that we've seen them on Mars, what do we know about them and what does their geochemistry tell us about the environment where they landed?
pdf link, Meteorites Found on Mars
19 DEC 07 Chips Off an Old Lava Flow
by G. Jeffrey Taylor
Lunar meteorite Kalahari 009 contains fragments of basalt about 4.35 billion years old, a record-breaking old age for mare basalt.
pdf link, Chips Off an Old Lava Flow
27 NOV 07 Getting to Know Vesta
by Linda M. V. Martel
Scientists are primed with geochemical data from HED meteorites for Dawn's encounter with asteroid 4 Vesta.
pdf link, Getting to Know Vesta
30 OCT 07 Did an Impact Make the Mysterious Microscopic Magnetite Crystals in ALH 84001?
by G. Jeffrey Taylor
Tiny crystals of magnetite in Martian meteorite ALH 84001 might have been made when shock waves decomposed iron carbonate.
pdf link, Microscopic Magnetite Crystals in ALH 84001
17 SEPT 07 Melted Crumbs from Asteroid Vesta
by Linda M. V. Martel
Researchers studying some of the rarest of the smallest meteorites call them melted crumbs from asteroid Vesta.
pdf link, Melted Crumbs from Asteroid Vesta
6 JULY 07 The Sun's Crowded Delivery Room
by G. Jeffrey Taylor
Isotopes in meteorites suggest that the Sun formed in a dense cluster of stars.
pdf link, The Sun's Crowded Delivery Room
18 APRIL 07 When Worlds Really Did Collide
by Edward Scott, Jijin Yang, and Joseph Goldstein
Cosmochemical studies and dynamical models of protoplanetary collisions suggest a new origin for iron meteorites.
pdf link, When Worlds Really Did Collide
25 JAN 07 Organic Globules from the Cold Far Reaches of the Proto-Solar Disk
by G. Jeffrey Taylor
Hollow organic globules in the Tagish Lake meteorite probably formed far from the proto-Sun, maybe even in interstellar space before our Solar System formed.
pdf link, Organic Globules from the Proto-Solar Disk
19 DEC 06 Squeezing Meteorites to Reveal the Martian Mantle
by G. Jeffrey Taylor
Experiments at high temperature and pressure give clues to the composition of the interior of Mars.
pdf link, Squeezing Meteorites to Reveal the Martian Mantle
21 JULY 06 Iron Meteorites as the Not-So-Distant Cousins of Earth
by William F. Bottke and Linda M. V. Martel
Numerical simulations suggest that some iron meteorites are fragments of the long lost precursor material that formed the Earth and other terrestrial planets.
pdf link, Iron Meteorites as the Not-So-Distant Cousins of Earth
14 JUNE 06 Fossil Meteorite Unearthed From Crater
by Linda M. V. Martel
A meteorite of unusual chondritic composition was found in a highly unlikely place, challenging how we think about colossal impact events on Earth.
pdf link, Fossil Meteorite Unearthed From Crater
26 MAY 06 Interstellar Organic Matter in Meteorites
by G. Jeffrey Taylor
Carbonaceous chondrites contain organic compounds with high deuterium/hydrogen ratios, suggesting they formed in interstellar space.
pdf link, Interstellar Organic Matter in Meteorites
31 JAN 06 Cosmochemistry from Nanometers to Light-Years
by G. Jeffrey Taylor
Cosmochemists and astronomers test theories on the formation of stars and planets.
pdf link, Cosmochemistry from Nanometers to Light-Years
27 DEC 05 Magma and Water on Mars
by G. Jeffrey Taylor
Martian meteorites tell us part of the fascinating story about when volcanoes erupted and water flowed.
pdf link, Magma and Water on Mars
21 OCT 05 Little Chondrules and Giant Impacts
by G. Jeffrey Taylor
Chondrules in metal-rich meteorites formed a couple of million years after most other chondrules, possibly by impact between moon-sized or larger objects.
pdf link, Little Chondrules and Giant Impacts
30 SEPT 05 Portales Valley: Not Just Another Ordinary Chondrite
by Alex Ruzicka and Melinda Hutson
A melted meteorite gives a snapshot of the heat and shock that wracked an asteroid during the first stages of differentiation.
pdf link, Portales Valley Meteorite
29 JULY 05 Martian Meteorites Record Surface Temperatures on Mars
by G. Jeffrey Taylor
Gases trapped in Martian meteorites indicate that Mars has been a cold desert for a long, long time.
pdf link, Martian Meteorites Record Surface Temperatures on Mars
31 MAY 05 Making Sense of Droplets Inside Droplets
by G. Jeffrey Taylor
The vexing presence of chondrules inside supposedly older calcium-aluminum-rich inclusions (CAIs) in chondrites makes sense if the CAIs were remelted.
pdf link, Making Sense of Droplets Inside Droplets
13 APRIL 05 Antarctic Guide to Martian Weathering
by Linda M. V. Martel
Soils in the Antarctic Dry Valleys contain traces of silicate alteration products and secondary salts much like those found in Martian meteorites.
pdf link, Antarctic Guide to Martian Weathering
31 OCT 04 New Lunar Meteorite Provides its Lunar Address and Some Clues about Early Bombardment of the Moon
by G. Jeffrey Taylor
A newly discovered meteorite from the Moon provides a detailed record of its history, allowing scientists to make a reasonable guess about where it came from on the Moon and to test ideas for the timing of early impact bombardment.
pdf link, New Lunar Meteorite
26 AUG 04 Meteorite Shower in Park Forest, Illinois
by Linda M. V. Martel
An L5 chondrite strewnfield is centered at Park Forest, Illinois, a southern suburb of Chicago.
pdf link, Meteorite Shower in Park Forest, Illinois
5 JULY 04 New Mineral Proves an Old Idea about Space Weathering
by Linda M. V. Martel
A newly discovered vapor-deposited iron silicide in a lunar meteorite has been named hapkeite.
pdf link, New Mineral Proves an Old Idea about Space Weathering
1 JULY 04 Carbonates in ALH 84001: Part of the Story of Water on Mars
by Catherine M. Corrigan
The study of multi-generational carbonate assemblages in Martian meteorite ALH 84001 reveals a complex history of crystal formation, growth, and alteration.
pdf link, Carbonates in ALH 84001
23 JUNE 04 The Multifarious Martian Mantle
by G. Jeffrey Taylor
Detailed analyses of Martian meteorites reveal that the planet's interior preserves distinctive regions that formed 4.5 billion years ago.
pdf link, The Multifarious Martian Mantle
1 JUNE 04 Silicate Stardust in Meteorites
by G. Jeffrey Taylor
Silicates are the most abundant solids in disks around growing stars, but presolar silicates have not been found in even the most primitive meteorite--until now.
pdf link, Silicate Stardust in Meteorites
2 APRIL 04 Asteroid Heating: A Shocking View
by G. Jeffrey Taylor
Mineral intergrowths in chondritic meteorites may indicate that some asteroids were heated by impact.
pdf link, Asteroid Heating: A Shocking View
9 MAR 04 Tiny Traces of a Big Asteroid Breakup
by Linda M. V. Martel
Fossil meteorites and chromite grains record a hundred-fold increase in the number of meteorites that fell 480 million years ago compared to the meteorite influx today.
pdf link, Tiny Traces of a Big Asteroid Breakup
21 MAY 03 Triggering the Formation of the Solar System
by G. Jeffrey Taylor
New data from meteorites indicates that formation of the Solar System was triggered by a supernova.
pdf link, Triggering the Formation of the Solar System
28 APRIL 03 Asteroidal Lava Flows
by G. Jeffrey Taylor
Meteorite studies indicate that we have pieces of lava flows from at least five asteroids.
pdf link, Asteroidal Lava Flows
23 JAN 03 QUE 93148: A Part of the Mantle of Asteroid 4 Vesta?
by Christine Floss
A tiny meteorite tells a story of melting in the deep mantle of a big asteroid.
pdf link, QUE 93148 Meteorite
12 DEC 02 Tagish Lake -- A Meteorite from the Far Reaches of the Asteroid Belt
by David W. Mittlefehldt
A new type of primitive meteorite with much to tell us about the formation of the solar system.
pdf link, Tagish Lake Meteorite
24 OCT 02 The First Rock in the Solar System
by Steven B. Simon
An aggregate of corundum, hibonite, and perovskite may be among the first rocks to form in the Solar System.
pdf link, The First Rock in the Solar System
30 SEPT 02 Using Aluminum-26 as a Clock for Early Solar System Events
by Ernst Zinner
Correspondence between 26Al and Pb-Pb ages shows that 26Al records a detailed record of events in the early solar system.
pdf link. Using Al-26 as a Clock for Early Solar System Events
25 SEPT 02 Dating the Earliest Solids in our Solar System
by Alexander N. Krot
Lead isotopic analyses give absolute formation ages of Ca-Al-rich inclusions and chondrules.
pdf link, Dating the Earliest Solids in our Solar System
30 AUG 02 The Wet, Oxidizing Crust of Mars
by G. Jeffrey Taylor
Analysis of isotopes and oxide minerals in Martian meteorites indicate that many magmas interacted with a wet, oxidizing crust as they oozed from the Martian mantle to its reddish surface.
pdf link, The Wet, Oxidizing Crust of Mars
13 MAY 02 Resolution of a Big Argument About Tiny Magnetic Minerals in Martian Meteorite
by Edward R. D. Scott and David J. Barber
Magnetic minerals in Martian meteorite ALH 84001 formed as a result of impact heating and decomposition of carbonate. They were never used as compasses by Martian microorganisms.
pdf link, Resolution of a Big Argument ALH84001
28 FEB 02 Searching Antarctic Ice for Meteorites
by Linda M. V. Martel
Silver anniversary season: The vigorous life and times of the ANSMET team at Meteorite Hills resulted in a new set of 336 meteorites collected off the ice.
pdf link, Searching Antarctic Ice for Meteorites
26 FEB 02 The Composition of Asteroid 433 Eros
by G. Jeffrey Taylor
X-rays and reflected light suggest that asteroid 433 Eros is similar in composition to the most common type of meteorite--maybe.
pdf link, Composition of Asteroid 433 Eros
3 DEC 01 Oxygen Isotopes Give Clues to the Formation of Planets, Moons, and Asteroids
by Edward R. D. Scott
As they formed from gas and dust near the Sun, grains in some meteorites acquired oxygen that originated in numerous other stars that shone long before our solar system was born.
pdf link, Oxygen Isotopes
7 NOV 01 Meteorites on Ice
by Linda M. V. Martel
Antarctic meteorites provide a continuous and readily available supply of extraterrestrial materials, stimulating new research and ideas in cosmochemistry, planetary geology, astronomy, and astrobiology.
pdf link, Meteorites on Ice
24 APRIL 01 Gullies and Canyons, Rocks and Experiments: The Mystery of Water on Mars
by G. Jeffrey Taylor
The combination of analyses of Martian meteorites and laboratory experiments helps scientists understand how water in magma has changed the Martian crust and surface.
pdf link, The Mystery of Water on Mars
2 MAR 01 Relicts from the Birth of the Solar System
by G. Jeffrey Taylor
Rapidly cooled silicate droplets found in unusual meteorites may have formed directly from the cloud of gas and dust surrounding the young Sun.
pdf link, Relicts from the Birth of the Solar System
24 JAN 01 Lunar Meteorites and the Lunar Cataclysm
by Barbara A. Cohen
Dating of impact melts in lunar meteorites supports the idea that the Moon was intensely bombarded about 3.9 billion years ago.
pdf link, Lunar Meteorites and the Lunar Cataclysm
30 SEPT 00 The Oldest Metal in the Solar System
by G. Jeffrey Taylor
Grains of metallic iron in some chondritic meteorites condensed from hot clouds of gas and dust while the Sun was forming.
pdf link, The Oldest Metal in the Solar System
24 MAY 00 Liquid Water on Mars: The Story from Meteorites
by G. Jeffrey Taylor
Martian meteorites may have reacted with liquid water on Mars intermittently during the past 650 million years.
pdf link, Liquid Water on Mars: The Story from Meteorites
10 MAR 00 Flash Heating
by G. Jeffrey Taylor
Extremely rapid heating of rocky materials in a furnace is possible, making it feasible to study the formation of melted droplets in meteorites.
pdf link, Flash Heating
17 DEC 99 Difficult Experiments on Weird Rocks
by G. Jeffrey Taylor
Melting experiments on oxygen-depleted meteorites give clues about magma compositions and core formation in asteroids.
pdf link, Difficult Experiments on Weird Rocks
24 NOV 99 Purple Salt and Tiny Drops of Water in Meteorites
by G. Jeffrey Taylor
Two meteorites contain crystals of sodium chloride that have trapped tiny drops of ancient salty water.
pdf link, Purple Salt and Tiny Drops of Water in Meteorites
24 AUG 99 Honeycombed Asteroids
by G. Jeffrey Taylor
Asteroids have lower densities than expected, probably because they have been disrupted and then reassembled into porous rubble piles.
pdf link, Honeycombed Asteroids
30 JULY 99 Fossils Blowing in the Wind: More Contamination of Antarctic Meteorites
by G. Jeffrey Taylor
Terrestrial microfossils occur in cracks in Antarctic meteorites, making it difficult to search for extraterrestrial life in meteorites.
pdf link, Contamination of Antarctic Meteorites
20 JULY 99 An Adulterated Martian Meteorite
by G. Jeffrey Taylor
Martian meteorite EETA79001 may have formed by impact melting and mixing of other Martian rocks, not by simple igneous activity as originally thought.
pdf link, An Adulterated Martian Meteorite
3 JUNE 99 Martian Organic Matter in ALH84001?
by G. Jeffrey Taylor
Indigenous organic compounds in ALH84001 may be from meteorite bombardment of the surface of Mars.
pdf link, Martian Organic Matter in ALH84001?
21 APRIL 99 30th Lunar and Planetary Science Conference: Some Highlights
by G. Jeffrey Taylor
The annual LPSC featured bacteria, new views of the Moon, and an intriguing new meteorite.
pdf link, 30th Lunar and Planetary Science Conference: Some Highlights
8 FEB 99 From a Cloud of Gas and Dust to an Asteroid with Percolating Hot Water
by G. Jeffrey Taylor
Isotopes of manganese and chromium indicate that chemical reactions involving hot water altered minerals on water-bearing asteroids during the same time interval that other asteroids were melted, between 7 and 16 million years after the first solids formed in the Solar System.
pdf link, From a Cloud of Gas and Dust to an Asteroid
12 NOV 98 Dry Droplets of Fiery Rain
by G. Jeffrey Taylor
Experiments test an idea for the origin of droplets of rocky material melted before the planets formed.
pdf link, Dry Droplets of Fiery Rain
17 FEB 98 Organic Compounds in Martian Meteorites May Be Terrestrial Contaminants
by A. J. T. Jull
Carbon-14 measurements indicate that most of the organic compounds in martian meteorite ALH84001 were acquired on Earth, not Mars, weakening the case for fossil martian life in the meteorite.
pdf link, Organic Compounds in Martian Meteorites May Be Terrestrial Contaminants
18 DEC 97 Fossils in Martian Meteorite: Real or Imagined?
by G. Jeffrey Taylor
Some scientists suggest that the small, wormy structures in martian meteorite ALH84001 are features of the crystals in the rock, decorated with artifacts introduced during sample preparation, not nanofossils. The discoverers of the fossil-like objects disagree.
pdf link, Fossils in Martian Meteorite: Real or Imagined?
22 AUG 97 Testing the Evidence for Life on Mars: NASA and NSF Fund New Studies of Martian Meteorite
by G. Jeffrey Taylor
Newly awarded grants will fund 23 projects to further analyze martian meteorite ALH84001 and the details that led to last year's announcement of possible ancient martian life.
pdf link, Testing the Evidence for Life on Mars
8 JULY 97 Moving Stars and Shifting Sands of Presolar History
by Donald D. Clayton
Meteorites contain tiny grains of minerals cast off from ancient stars before the birth of our own Solar System. These grains tell a story of element formation, motions inside stars, and migration of stars in the Galaxy.
pdf link, Moving Stars and Shifting Sands of Presolar History
22 MAY 97 Shocked Carbonates may Spell N-o L-i-f-e in Martian Meteorite ALH84001
by Edward R. D. Scott
Evidence for redistribution of carbonates by shock casts doubt on fossil life in martian meteorite.
pdf link, Shocked Carbonates may Spell No Life in Martian Meteorite ALH84001
22 MAY 97 Low-temperature Origin of Carbonates Consistent with Life in ALH84001
by G. Jeffrey Taylor
Evidence from magnetism and isotopes consistent with life in martian meteorite.
pdf link, Low-temp Origin of Carbonates Consistent with Life in ALH84001
31 MAR 97 Life on Mars--The Debate Continues
by G. Jeffrey Taylor
Scientists continue their search for answers to the question of fossil life in a martian meteorite. Have we found evidence for life, nonbiologic processes or contamination? The great debate is far from over.
pdf link, Life on Mars--The Debate Continues
31 MAR 97 Not Quite a Meeting of the Minds
by G. Jeffrey Taylor
The debate about life in martian meteorite ALH 84001 at the 28th Lunar and Planetary Science Conference was vigorous. Some investigators will turn out to be right, others wrong, but there will be no losers.
pdf link, Not Quite a Meeting of the Minds
21 DEC 96 Meteorites from Mars, Rocks from Canada
by Rachel C. Friedman
There is more to Mars rocks than suspected fossils. Scientists are using ancient lava flows in eastern Ontario to understand the formation of a group of meteorites from Mars.
pdf link, Meteorites from Mars, Rocks from Canada
18 OCT 96 Life on Mars?
by G. Jeffrey Taylor
A group of scientists, headed by Dr. David McKay of Johnson Space Center, have made a case for ancient life on Mars based on features in a meteorite found in Antarctica. Do we indeed have evidence of life on Mars?
pdf link, Life on Mars?
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