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For a planet to be able to support human
life it would need to be almost then exact
same as Earth.
To be more specific:
- the same basic elements in the same relative concentrations
- the same mass and radius as Earth
- the same rotation as the Earth
- a sun with the same temperature and luminosity as our sun
- an orbit that is the same distance from its sun as Earth
- a large moon
- the same geological activity
- the same basic climates as Earth
Why?
We only exist because Earth is in a perfect balance with the solar system and the sun. If just one thing change by a tiny bit there would be no possiblity of human life. It is incredible how many things need to be absolutely perfect for human life to exist.
The habitable zone is the region around a star with sufficient atmospheric pressure to maintian water on its surface.
Overall, it would be very hard for
a planet to meet the criteria to
support life but in an infinite universe
anythings possible.
This is the newly found planet Kepler-22b. Scientists are saying it might be possible for human life to exist on it.
They are saying
this because it fits
into the habitable
zone which means
it is relatively the
same as earth.
Photo based on: 'horizon' by pierreyves @ flickr