... outside our solar system.
Kepler has discoverd theree planets around the star KOI-961, and they are a mere 0.78, 0.73 and 0.57 times the radius of Earth, rocky like the earth, but alas, they are too close to the star so there can't be any liquid water on them. But still, there are hardly any rocky exoplanets known, and the small ones are hard to find.
And the possibility of life being on them is, well, just have a look:
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First, there were big-giant planets discovered orbiting other stars. Then, more recently, a planet in the star's Goldilocks Zone ... where water would be at least sometimes liquid, were it present. But that was a big planet that may or may not have been truly "class M" in having a surface,…
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"Day after day, day after day,
We stuck, nor breath nor motion;
As idle as a painted ship
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Water, water, every where,
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Image credit: retrieved from Universe-Review.ca.
Perhaps…