We really
don't know the conditions required for life in general. We only know what is
required for life like us.
1. Liquid
water -habitability is basically determined by liquid water as it is an
excellent solvent for chemicals & provide medium for chemical reactions of
living beings. But some life forms might be based on other liquids.
2. Elements
or Organic compounds - life on Earth is made up of complex molecules based on
Carbon. Carbon is the only atom capable of forming large complex molecules.
3. Energy
source - Energy source need for synthesize complex organic molecules.
4. Atmosphere - To support liquids on its surface atmosphere is needed.
5. Temperature -temperature
of planet mainly depend on the distance from sun. Support life in a planet
needs temperature within 0-1000C with a pressure is at least 10mbars.
6.
Protection from harmful radiation - For example, Ozone layer around Earth act
as a protective cover from radiation.
7.
Stability -conditions must be stable to initiate and exist life. it takes time
for life to form and then evolve to complex forms capable of intelligence.
8. A
suitable planet - not so small or not so large. if it is so small, loses its
atmosphere. If it is massive, becomes “gas giants”.
9. Disaster avoidance -collision with large asteroid,
explosion of supernova very nearby can destroy life.
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