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SUMMARY:Manuel Scherf on &quot\;The evolution and prevalence of Earth-like
  Habitats in the Galaxy&quot\; - Manuel Scherf (Austrian Academy of Scienc
 es)
DTSTART:20241009T100000Z
DTEND:20241009T110000Z
UID:TALK222382@talks.cam.ac.uk
CONTACT:Paul B. Rimmer
DESCRIPTION:The existence of Earth-like Habitats\, i.e.\, temperate rocky 
 exoplanets hosting Earth-like N2-O2-dominated atmospheres with minor amoun
 ts of CO2\, depends on certain astrophysical\, geophysical\, and\, potenti
 ally\, biochemical criteria that must be met to allow for their evolution 
 and environmental stability. One essential factor for the emergence and ev
 olution of Earth-like atmospheres is a planet's host star. Its radiation a
 nd plasma environment may affect atmospheric stability to such an extent t
 hat it can even render its existence unlikely. Furthermore\, microbial lif
 e may be another parameter needed to allow for the simultaneous existence 
 of atmospheric O2 and N2 over geological timescales\, making an N2-O2-domi
 nated atmosphere with minor amounts of CO2 a potential sign of life to be 
 present on such a planet. I will address these and further important param
 eters relevant to the evolution of Earth-like atmospheres. First\, I focus
  on the terrestrial planets in our Solar System and then apply our underst
 anding of their atmospheric evolution to assess the prevalence of Earth-li
 ke Habitats in the Galaxy and around stars of different spectral types.
LOCATION:Battcock\, Room F17
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