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 Planetary Science Division 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 Earth Articles

Articles listed by publication date.

DATE POSTED

HEADLINE ARTICLES

PDF VERSIONS

JULY 2017 More on the Building Blocks of Planet Earth
by Linda M. V. Martel
CosmoSparks Report - Isotopic data from meteorites are used in the search for Earth-forming materials.
pdf link, Building Blocks of Earth
MAY 2017 Flux of O+ Ions from Earth to the Moon
by Linda M. V. Martel
CosmoSparks Report - Terrestrial O+ ions escape to the lunar surface when Earth's magnetosphere blocks the Moon from the solar wind.
pdf link, Flux of Oxygen Ions from Earth to the Moon
11 NOV 2016 Searching for Ancient Solar System Materials on the Moon, Earth, and Mars
by G. Jeffrey Taylor
The early history of the Solar System is recorded by meteorites falling now, but also by those that fell hundreds of millions to billions of years ago, preserved in lunar samples, sedimentary layers on Earth, and even sitting on the surface of Mars.
pdf link, Solar System Materials
JULY 2016 Remnants of Earth's Construction
by G. Jeffrey Taylor
CosmoSparks Report - Tungsten isotopic data from modern flood basalts show that regions of Earth's mantle have remained chemically isolated since they formed during accretion of the planet.
pdf link, W-isotopes
30 NOV 2015 Primeval Water in the Earth
by G. Jeffrey Taylor
Hydrogen isotopes in lavas derived from the deep mantle suggest the presence of a component inside the Earth that came directly from the primordial solar nebula.
pdf link, Primeval Water in the Earth
17 JUNE 2015 Tungsten Isotopes, Formation of the Moon, and Lopsided Addition to Earth and Moon
by G. Jeffrey Taylor
A distinct difference in tungsten isotopic composition between the Moon and Earth is consistent with the Moon and Earth starting with the same isotopic composition, but then modified by late accretion of different amounts of chondritic asteroids.
pdf link, Tungsten Isotopes in Earth and Moon
MAY 2015 Modeling Water Adsorption on Olivine Crystals in the Solar Nebula
by Linda M. V. Martel
CosmoSparks Report - Modeling results suggest a pathway for the formation of phyllosilicates, which could have been accreted into Earth.
pdf link, adsorption on olivine in the solar nebula
28 JAN 2015 Water in Asteroid 4 Vesta
by G. Jeffrey Taylor
The big, melted asteroid 4 Vesta provides clues to the source of water to Earth and Mars.
pdf link, Water in Asteroid 4 Vesta
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
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
OCT 2011 Earth's Heat
by Linda M. V. Martel
CosmoSparks Report - It is now possible to measure the radiogenic heat production inside Earth, previously estimated from element ratios in chondritic meteorites.
pdf link, Earth's Heat
APRIL 2011 The Role of H2S in Amino Acid Synthesis on Primordial Earth and Elsewhere
by Linda M. V. Martel
CosmoSparks Report - Intriguingly similar abundances of amino acids from historic lab samples and carbonaceous chondrites.
pdf link, The Role of H2S in Amino Acid Synthesis on Primordial Earth and Elsewhere
22 FEB 08 Compositional Balancing Before Moon Formation
by G. Jeffrey Taylor
The identical oxygen isotopic composition of Earth and Moon might be explained by exchange of material between the proto-Earth and the surrounding proto-lunar disk.
pdf link, Compositional Balancing Before Moon Formation
7 JULY 05 Squeezing and Heating Rock to Scope Out How Metallic Iron Dribbled to the Center of the Earth
by G. Jeffrey Taylor
Experiments showing how cobalt and nickel concentrate in molten metal shed light on the formation of Earth's metallic core.
pdf link, Squeezing and Heating Rock
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
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
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
28 FEB 01 Buckyballs and Gases May Mark Massive Extinction
by G. Jeffrey Taylor
Helium and argon isotopes in fullerenes suggest an impact triggered the incredible extinction that marks the end of the Permian period.
pdf link, Buckyballs and Gases May Mark Massive Extinction
31 DEC 98 Origin of the Earth and Moon
by G. Jeffrey Taylor
First hand report of the December 1998 conference on the formation and very early history of the Earth and Moon.
pdf link, Origin of the Earth and Moon
11 DEC 97 Damage by Impact: the case at Meteor Crater, Arizona
by Linda M. V. Martel
A look at the pre- and post-impact environments at Meteor Crater, Arizona provides insight into Earth's impact history. Just how often does this sort of impact event occur on Earth? We'll examine the potential hazards.
pdf link, Meteor Crater, AZ
21 DEC 96 Life Underground
by G. Jeffrey Taylor
Some bacteria live on nothing but rock and water, extracting energy from chemical reactions rather than from sunlight.
pdf link, Life Underground
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 Rules for Identifying Ancient Life
by G. Jeffrey Taylor
Scientists seeking the oldest fossils on Earth have developed rules for establishing that they have found fossils and that the fossils formed in place.
pdf link, Rules for Identifying Ancient Life
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