This is an image depicting all of the systems where we have found planets around stars that could sustain life, or could sustain us.
How can we tell?
We are able to see the distance the planet is from the sun and the size of each as well as radiation output to determine if it were possible for us to survive there. The image depicts the parent stars and the size of the planets that surround them.
For reference, on the upper right hand area is our sun and planet earth.
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