Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

Every meteorite tells a story

Two scientists hope meteorite samples spin tales about the conditions of Earth's early neighborhood.
Meteorite study
Purdue University scientists analyzed enstatite chondrite meteorites, like the sample pictured above, in a study of the materials near Earth at the dawn of the solar system. Data from the study may offer clues into the conditions under which the Earth formed — evidence of which no longer exists in terrestrial rock.
NASA
September 29, 2005
Scientists at Purdue University are trying to take the temperatures of the early solar system — and they're looking at meteorites for the answer.

Michael E. Lipschutz and Ming-Sheng Wang analyzed 29 enstatite chondrite (EC) meteorites — rocks that formed 4.5 billion of years ago, in close proximity to our planet. Lipschutz and Wang believe the analysis of these samples will help our understanding of the conditions in which our planet formed.

"What happened to these rocks most likely happened to Earth in its early stages, with one great exception," explains Lipschutz. "Shortly after early Earth formed, an object the size of Mars smashed into it, and the heat from the cataclysm irrevocably altered the geochemical makeup of our entire planet."

A key difference, according to Lipschutz, is the meteorite samples were not involved in this collision and, therefore, not chemically altered. Because they are similar matter to what formed early Earth, these fragments could be remnants of the material that eventually became our home planet.

By studying the chemistry of these samples, scientist can determine the surrounding temperatures of when the meteorites formed. To do so, chemists must identify and examine rare elements, such cadmium, indium, and thallium. These elements, also known as volatiles, function as natural thermometers.

"[Volatiles] can tell you whether the temperature was high or low when the rock formed," says Lipschutz. "We tested two different kinds of ECs, and the oldest, most primitive examples of each kind had very similar volatile contents — which means their temperature at formation was similar. These rocks have essentially recorded the temperature at which the early Earth formed, and we now know that this was much lower than 500° Celsius [932° Fahrenheit]."

While the findings are promising, many pieces of the puzzle remain. Scientists must study more EC meteorites and other solar-system samples to understand what the surrounding environment was like for our young planet.

The duo's paper appears in the September 27 edition of Environmental Chemistry.
0

JOIN THE DISCUSSION

Read and share your comments on this article
Comment on this article
Want to leave a comment?
Only registered members of Astronomy.com are allowed to comment on this article. Registration is FREE and only takes a couple minutes.

Login or Register now.
0 comments
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
BoxProductcovernov

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook

Loading...