Because we've already discovered several habitable worlds in our own solar system and elsewhere that life could exist on.
Life has to be common because it really isn't hard for the materials for life to form, they just have to be around at the right time and in the right
ways, and the universe is simply too big to allow it only once.
So there is no need or agenda just the idea there must be
another planet like earth somewhere.
So what are the prospects for this life.
The Moon has none except some cat that ran off in some
Mars might be as unprotected as the Moon from the
radiation factors of space.
Since the earth is well protected by our atmosphere there
would have to be a planet like earths to support life.
It is possible we are the only one human planet in the universe
and the chance of ever meeting impossible if another existed.
However there is no end to the imagination in the impossible
and seems to be no end to the creation of 2D life in pictures
and cartoons or films and video and of 3D life in the possibilities
in the universe.
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