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Chronological Thread 
  • From: ilka AT (Kalman Belane)
  • To: fizinfo AT
  • Subject: [Fizinfo] (nincs tárgy)
  • Date: Fri, 24 Jul 2009 14:57:31 +0200 (MEST)
  • List-archive: <>
  • List-id: ELFT HÍRADÓ <>


az MTA KTM Csillagászati Kutatóintézete
rendkivüli szemináriumára

Elõadók: Joseph Seckbach
Hebrew University of Jerusalem, Israel

seckbach AT



The extremophilic microorganisms (Prokaryotes and Eukaryotes) are models
for extraterrestrial life. These organisms grow in very severe conditions
(from our anthropocentric point) and are able to stay vital for many
millions of years under harsh environments. In the presentation, we will
survey specific extremophiles in further detail.
The branches of Astrobiology also deal also with possibilities for
finding traces of Life outside the planet Earth, mainly in the Solar
System. The most promising target bodies are certain planets, such as
Mars, and satellites, for example, within the Galilean moons of Jupiter,
are Europa, Ganymede, and Callisto.
Recent observations from flyby missions of space craft probes over
the surface of Mars and from rovers on its surface have shown that the red
planet was warmer and wetter billion of years ago. The present view
reveals contours of rivers, canyons, and other dried water bodies. It has
recently been reported that Mars contains water, perchloride, methane, and
other constituent requirements of life. It may be that microbial life from
the past has remained in a dormant status, as non-active spores, or that
Martian life is limited to the undersurface area, where it is protected
from the damaging surface conditions.
Europa is one of the large satellites of Jupiter. Its icy surface is
striated by cracks and streaks. It is known that a subsurface salty oceans
exist inside the moons of the Solar System gas, giant planets. Such
subsurface oceans were predicted for Europa, Titan, and Enceladus.
Therefore it is assumed that Europa.s upper surface floats over such an
ocean (of liquid water) which could serve as habitats of extraterrestrial
life.analogous to Vostok subsurface ocean).
Further investigations will shed additional light on the potential
extraterrestrial life on or inside Mars and Europa. If bacteria can
survive below this glacier in Antarctica for millions of years, why not
below the ice cap on Mars and on Europa? All the above facts serve to
encourage us to intensify our search for life on the close-by planet and
on some satellites.

Az elõadás idõpontja: 2009. augusztus 5, szerda, 14 óra

Helye: MTA KTM CSKI elõadóterme
Budapest, XII., Konkoly Thege M. út 15-17.

Patkós László s.k.

  • [Fizinfo] (nincs tárgy), Kalman Belane, 07/24/2009

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