Interesting summary of the top 5 ‘habitable planets’

I recently came across this really interesting and informative picture, describing the so-called ‘habitable planets’ discovered so far (top 5). Planet habitability is a measure of how suitable a planet (or natural satellite) is for life, under the conditions we know so far.

Click the picture for full size.

I got the pic from Imgur – if anybody else knows the main source, please be kind and share it with us.

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