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Bob Stein

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41 Can you tack against the sun using a solar sail? Jul 24 '13
17 How much sunlight gets to the surface of Titan? What would astronauts see? Jan 16 '15
7 Will kicked-up “dust” be a problem for Rosetta and lander Philae? Aug 19 '14
2 How would we move Venus or Mars into Earth's orbital zone? [closed] Feb 28 '14
2 How do jetpacks work in space? Jan 16 '15
-2 What are the benefits of tides? Should we look for them on exoplanets? [closed] Feb 28 '14

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