Worldbuilding
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Sean Raymond

American astrophysicist living in France. I also blog at planetplanet.net.

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84 Can two adjacent, life-sustaining planets orbit a star such that they are rarely near each other? Dec 12 '17
24 Why didn't we detect that exoplanet before? Dec 5 '17
22 How critical is it for life that a planet remains within the habitable zone at all times? Dec 14 '17
15 What would the effect be on Earth if Mars disappeared? Aug 3 '16
14 What would the effect be on Earth if Mars disappeared? Aug 3 '16
12 Can 3 planets rotate around each other like this? Sep 1 '16
11 Is my Solar System scientifcally possible? Dec 19 '17
10 An Eden-like moon orbits a barren terrestrial planet. Why is the planet barren while its moon is earthlike? Aug 30 '18
10 Would life still be possible on Earth if its atmosphere suddenly became as dense as the Venusian? Jul 5 '16
9 What would block a planet from seeing the stars? Jun 27 '16
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