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Forming Earths and Mercuries: solids less volatile than water
  Astrobiology

Friday 15 August 2014
from 15:15 to 16:00
at 122:026
Speaker : Alexander Hubbard (American Museum of Natural History, New York)
Abstract : Life requires a variety of chemicals and elements. The question of water, how it was delivered to Earth and how it would be delivered to exoplanets, has taken a central position. However, other chemicals and elements are also important. Earth is significantly (~80%) depleted in elements important for life like sodium and potassium, both much less volatile than water, but much more volatile than silicon, magnesium, or iron. Part of the composition of planets is set during their formation process, when the solids are still in sub-cm dust grains. I will discuss both the supply of moderately volatile elements to the proto-Earth, and why Mercury is extremely iron rich. Both processes should play major roles in exoplanet formation, with consequences for their chemistry and hence any possible biology.

arXiv:1407.0274

AlbaNova  | Last modified 08 August 2014 05:40  |  HELP