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Aqueous Alteration and Accretion of Chondrite Parent Bodies: When and Where

By and | October, 2016

Events such as the Shoemaker−Levy 9 comet impact into Jupiter (July 1994) and the Chelyabinsk meteorite impact in Russia (February 2013) are reminders of the dynamic processes that were part of the formation of our Solar System from a protosolar molecular cloud of interstellar and circumstellar dust and gas. High-temperature (up to 2000 K) transient heating events (e.g. shock waves, current sheets, lightning, etc.) resulted in thermal processing (evaporation, condensation, and melting) of the primordial molecular cloud matter. In general, however, the ambient temperature of the disk decreased radially from the proto-Sun. When temperatures fell below 160 K, water vapor condensed directly into water ice, forming a front known as the “snow line”. The snow line likely did not reside at a single location in the disk, but rather migrated as the luminosity of the proto-Sun, mass accretion rate, and disk opacity all evolved with time. Some models suggest that the snow line could be located at about 5 astronomical units (1 AU = average distance between Earth and the Sun) early in disk evolution, which is not far from Jupiter’s current orbit, but is likely to have been present at 2−3 AU when the disk was just 2−4 My old (Ciesla and Cuzzi 2005).

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NASA’s Cosmic Dust Program: Collecting Dust Since 1981

By | June, 2016

Download Article (PDF) June 2016 Issue Table of Contents 1811-5209/16/0159-$0.00 DOI: 10.2113/gselements.12.3.159 Cosmic dust refers to particles that originate from the interplanetary medium and that have a diameter of ~100 µm or smaller (Brownlee 1985). This material, also known as interplanetary dust particles (IDPs), can be collected directly from Earth’s atmosphere, Larger grains of between 100…

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Qarabawi’s Charm: Looking Beyond the Science

By | February, 2016

Download Article (PDF) February 2016 Issue Table of Contents 1811-5209/16/0012-$0.00 DOI: 10.2113/gselements.12.1.73 If you have been reading CosmoELEMENTS over the last few years, you will have realized that much of our understanding of Solar System history, including its earliest events, is derived from the study of meteorites. Scientifically, they are exceptionally valuable samples and, as such,…

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Archived CosmoElements (PDF)

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2015 Issues -- Volume 11

February 2015

James W. Ashley

"THE STUDY OF EXOGENIC ROCKS ON MARS—AN EVOLVING SUBDISCIPLINE IN METEORITICS?"

June 2015

Philip A. Bland, Gretchen K. Benedix, and the Desert Fireball Network (DFN) Team

"CATCHING A FALLING STAR (OR METEORITE) – FIREBALL CAMERA NETWORKS IN THE 21st CENTURY"

October 2015

Kelsi Singer

"MEET PLUTO AND CHARON … AND NIX AND HYDRA!"

 

2014 Issues -- Volume 10

February 2014

Larry R. Nittler

"NEAR-SHOEMAKER AT EROS: THE FIRST DETAILED EXPLORATION OF AN ASTEROID"

June 2014

Carl Agee

"BLACK BEAUTY: A UNIQUE 4.4 GA, WATER-RICH METEORITE FROM MARS"

October 2014

Gregory F. Herzog and Rainer Wieler

"COSMOGENIC NUCLIDES IN THE INNER SOLAR SYSTEM: SURFACE EXPOSURE AGES FOR MARS AND ASTEROID 25143 ITOKAWA "

 

2013 Issues -- Volume 9

April 2013

Shoshana Z. Weider and Larry R. Nittler

"THE SURFACE COMPOSITION OF MERCURY AS SEEN FROM MESSENGER"

June 2013

Linda Martel and Cari Corrigan

"THE CHELYABINSK, RUSSIA,
METEORITE FALL"

October 2013

Monica M. Grady

"NITROGEN IN PLANETARY MATERIALS"

 

2012 Issues -- Volume 8

February 2012

Cari Corrigan, Andrew Beck, and Tim McCoy

"MISSIONS TO ASTEROIDS: JOURNEYING TO THE BEGINNING OF OUR SOLAR SYSTEM"

June 2012

Steven B. Simon

"THE ENDURING LEGACY OF THE ALLENDE METEORITE"

October 2012

Donald E. Brownlee

"THE STARDUST COMET MISSION: STUDYING SEDIMENTS FROM THE SOLAR SYSTEM’S FROZEN ATTIC"

 

2011 Issues -- Volume 7

December 2009

Cari Corrigan

"ANTARCTICA: THE BEST PLACE ON EARTH TO COLLECT METEORITES"

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