Battered asteroid may have warm core (MIT)
On July 10, 2010, the European Space Agency’s Rosetta probe flew by the
asteroid 21 Lutetia, which at the time was the largest asteroid ever to have
been visited by a spacecraft. The fly-by occurred 282 million miles from
Earth; close-up images taken by the probe revealed cracks and craters running
across Lutetia’s surface, evidence of the asteroid’s long and battered
history.
Now an international team of researchers from France, Germany, the Netherlands
and the United States has analyzed Lutetia’s surface images, and found that
underneath its cold and cracked exterior, the asteroid may in fact have once
harbored a molten-hot, metallic core. The findings suggest that Lutetia,
despite billions of years of impacts, may have retained its original structure
— a preserved remnant of the very earliest days of the solar system.
The results are published in a series of three papers in the journals
_Science_ and _Planetary Space Science_ (_PSS_).
_
_Benjamin Weiss, an associate professor of planetary sciences in MIT’s
Department of Earth, Atmospheric and Planetary Sciences, says a melted core
within Lutetia may exemplify a “hidden diversity” within the greater asteroid
belt.
“There might be many bodies that have cores and interesting interiors that we
never …
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