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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20081007T000000
DTEND;TZID=Atlantic/Canary:20081007T010000
UID:iactalks-168
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/168
CREATED:2008-10-07T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Small bodies and big impacts: comets, asteroids, and the origin of 
 water and organics on Earth
DESCRIPTION:Small bodies and big impacts: comets, asteroids, and the origin
  of water and organics on Earth\nDr. Humberto Campins\n\nThe role of aster
 oids and comet impacts on the origin of Earth’s water and organic mo
 lecules is reviewed. Earth is believed to have formed dry, and magma ocean
 s probably destroyed any primordial organics on Earth. The oldest clear ev
 idence for water on Earth is about 3.85 Ga, right after the “Late He
 avy Bombardment” (LHB). Asteroid and comet impacts during the LHB pr
 obably contributed significantly to Earth’s water and organic invent
 ory. Evidence for this contribution is found in the D/H isotopic ratios of
  meteorites and comets. The abundance and variety of organic solids in ast
 eroids and comets also point at a significant contribution to the organic 
 inventory of the early Earth. However, the pieces of this puzzle do not al
 l fit into a neat picture and several questions remain unanswered.
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