Derek Sears (NASA) on Meteorites

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Derek Sears (NASA) at a LASER http://www.scaruffi.com/leonardo/nov2012.html

Derek Sears (NASA) at a LASER http://www.scaruffi.com/leonardo/nov2012.html

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  • 1. Sometimes Space Comes to us: The Science of Meteorites. Derek Sears Research Scientist NASA Ames Research Center LASER - 14th November 2012
  • 2. Peekskill meteorite October 9, 1992
  • 3. Basalt Meteorites from Vesta
  • 4. Meteorites from Mars and the Moon
  • 5. Meteorites from Primitive Asteroids Ida Gaspra Mathilde Steins Eros
  • 6. Asteroids Close Up
  • 7. The 200-year Pathway to Meteorite Classification
  • 8. “Sunstuff” 4.6 Billion Years Old Strange mixture
  • 9. Formation of the Solar System
  • 10. Meteorite Origins – So Many Problems Formed in the Nebula Formed by Impact• Too much Na etc. • Energetic melts lost• Too much oxygen • Impact velocities not high• Compound chondrules enough• No evidence for existence in • Textures unlike crater rocks space (cosmic ray • Where are the young ages? tracks, solar wind products) • Oxygen isotope data• Cooled slowly suggests highly diverse reservoirs for components
  • 11. Trying to SimulateAsteroid ConditionsDifficult
  • 12. Missions to Land, Collect, and Return Samples are now Technically Feasible NEAR on Eros on 2001 Hyabusa on Itokawa in 2005 OSIRIS Rex on 1999 RQ36 in 2018
  • 13. To Read More About It ……$38.00 (paperback)$164.00 (hard cover)