Planetary scientists sharing ideas and discoveries.

Planetary Science Research Discoveries (PSRD) is an educational site sharing the latest research being made by NASA-sponsored scientists on meteorites, planets, and other bodies 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.

Supported by NASA's Cosmochemistry Program and Hawai`i Space Grant Consortium.

Archive of Asteroid Articles

DATE POSTED	ARTICLES
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.	PSRD-Vesta.granite-like.pdf
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.	PSRD-asteroidalMagmas.pdf
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.	PSRD-H-chondrite-parent.pdf
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.	PSRD-HEDs-Vesta.pdf
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.	PSRD-cosmicSpherules.pdf
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.	PSRD-irons.pdf
27 NOV 06	Hit-and-Run as Planets Formed by G. Jeffrey Taylor Collisions between large protoplanets as the planets formed may have ripped some of them to shreds, producing molten asteroid-sized bodies, driving off water and other volatiles, and scrambling partially molten protoplanets.	PSRD-hit-and-run.pdf
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.	PSRD-asteroidGatecrashers.pdf
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.	PSRD-asteroidHeating.pdf
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.	PSRD-fossilMeteorites.pdf
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.	PSRD-asteroidalLava.pdf
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.	PSRD-QUE93148.pdf
28 JUNE 02	Using Chondrites to Understand the Inside of Asteroid 433 Eros by Linda M. V. Martel Data from ordinary chondrite meteorites and from the NEAR mission suggest that asteroid 433 Eros is heavily fractured.	PSRD-ErosPorosity.pdf
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.	PSRD-eros.pdf
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.	PSRD-Oisotopes.pdf
21 NOV 00	Mining the Moon, Mars, and Asteroids by G. Jeffrey Taylor Applied cosmochemistry plays a key role in plans to use the resources of the Moon, Mars, and asteroids.	PSRD-mining.pdf
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.	PSRD-indarch.pdf
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.	PSRD-asteroidDensity.pdf
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.	PSRD-fayalite.pdf
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.	PSRD-chondrules.pdf


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