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peterh

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24 Is there any orbit at which the Roche limit can be “felt”? Jul 14 '18
15 Is there a star over my head? Sep 8 '19
15 Can a system of three stars exist? Aug 31 '19
13 How was the Earth-Sun distance originally calculated? Sep 5 '14
11 Satellite in orbit in front of and behind the Moon Jul 20 '19
11 Is there anything like a supermassive white hole? How are they formed? And where are they present? Sep 4 '16
8 How well would the Moon protect the Earth from an Asteroid? Jul 30 '19
8 Lunar orbit distance Aug 9 '18
8 What is the characteristic time of the evaporation of the galaxies? Feb 22 '20
7 If the Sun disappeared, could some planets form a new orbital system? Feb 23
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