[astro] the physics arXiv blog

[Eugen Leitl]

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From: the physics arXiv blog <howdy at arxivblog.com>
Date: Thu, 4 Sep 2008 14:50:13 -0500 (CDT)
To: eugen at leitl.org
Subject: the physics arXiv blog
Reply-To: the physics arXiv blog <howdy at arxivblog.com>


[1]the physics arXiv blog

   [2]Could life have come from other stars?

   Posted: 04 Sep 2008 02:50 AM CDT

   [3]exo-planet-life.jpg 

   Late in the last century, researchers calculated that an asteroid
   impact on Mars could jettison rocks  towards Earth in a way that
   preserved bacterial life within them; the implication being that life
   could have evolved first on a warmer wetter Mars and later seeded life
   on Earth.

   Now Mauri Valtonen from Turku University in Finland and
   colleagues have worked out whether bacteria might have been able to
   make a similar journey from a planet orbiting another star.The answer
   is probably not.

   But there is with one important caveat.The sun almost certainly formed
   in a star-birthing nursery with various other stars which later
   dispersed. It's quite possible, say the team, that bacteria could have
   passed from one system to another while all these star systems were
   close together.

   Nobody knows which stars are the sun's sisters and brothers but
   various groups are looking to solve this conundrum. In particular, the
    European Space Agency's Gaia observatory (launch date 2011)  is
   designed to create a 3D map of our galaxy that should allow us to work
   out what came from where. Studying these stars will then become an
   obsession for various astronomers.

   Equally likely, of course, is the possibility that Earth seeded
   planets around these stars with life.So if you work on Gaia, don't be
   surprised to find somebody staring right back at us.

   Ref:[4]arxiv.org/abs/0809.0378 : Natural Transfer of Viable Microbes
   in Space from Planets in the Extra-Solar Systems to a Planet in our
   Solar System and Vice-Versa

   [5][arXivblog?i=W8gZsk] 
   [6][arXivblog?i=B7bu7L] [7][arXivblog?i=DvinbL]
   [8][arXivblog?i=NUyPrl] [9][arXivblog?i=a2d4OL]
   [10][arXivblog?i=R6gJIl] [11][arXivblog?i=dXnZJL]
   [12][arXivblog?i=dO4XVl] [13][arXivblog?i=7krx9L] 
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References

   1. http://arxivblog.com/
   2. http://feeds.feedburner.com/~r/arXivblog/~3/383057996/
   3. http://arxivblog.com/wp-content/uploads/2008/09/exo-planet-life.jpg
   4. http://arxiv.org/abs/0809.0378
   5. http://feeds.feedburner.com/~a/arXivblog?a=W8gZsk
   6. http://feeds.feedburner.com/~f/arXivblog?a=B7bu7L
   7. http://feeds.feedburner.com/~f/arXivblog?a=DvinbL
   8. http://feeds.feedburner.com/~f/arXivblog?a=NUyPrl
   9. http://feeds.feedburner.com/~f/arXivblog?a=a2d4OL
  10. http://feeds.feedburner.com/~f/arXivblog?a=R6gJIl
  11. http://feeds.feedburner.com/~f/arXivblog?a=dXnZJL
  12. http://feeds.feedburner.com/~f/arXivblog?a=dO4XVl
  13. http://feeds.feedburner.com/~f/arXivblog?a=7krx9L
  14. http://arxivblog.com/
  15. http://www.feedburner.com/fb/a/emailunsub?id=8632699&key=kesJ612ZsV
  16. http://feeds.feedburner.com/arXivblog
  17. http://feeds.feedburner.com/arXivblog

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-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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