"I've read that microbes survived an early mission to the Moon, most recently in David Grinspoon's book 'Lonely Planets.'"
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Seminar Detail
Star and Planet Formation
Presenter: John Bally
May 19, 2003 12:00 AM Pacific
How common are habitable planets in the Universe? We can seek an answer by
searching for planets around other stars, or by probing the conditions in
which planets form. I will review the second approach. Planets are a
direct by-product of the star-formation process. The majority (~90%) of
stars in the sky form in giant molecular clouds along with luminous,
short-lived, but highly destructive massive stars. In these environments,
proto-planetary disks are subjected to collisions, harsh radiation fields,
powerful winds, and explosions. Thus, potential planet forming disks may be
short lived. The Hubble Space Telescope has provided direct evidence for
rapid disk destruction in the Orion Nebula. These observations imply that
either planets form very rapidly, or that planetary systems will be
relatively rare. I will review our understanding of star and planet
formation with an emphasis on recent observational results.
Participation Instructions
http://nai.arc.nasa.gov/seminars/instructions.cfm
December 21, 2007
