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• Is it time to develop a crashing satellite defense system for the whole Earth?

  Asked by ETpro | 11 responses

• If a planet migrates into a new orbit, what exactly happens to its satellites?

  Asked by Qingu | 10 responses

• Why do we always see one side of the moon?

  Asked by intro24 from iPhone | 22 responses

• How far does the moon travel in a year?

  Asked by GeorgeGee | 16 responses

• Could we knock Earth out of its own orbit?

  Asked by Qingu | 14 responses

• Question on velocity of an object orbiting a planet.

  Asked by quilm | 7 responses

• How do spy satellites get positioned?

  Asked by Ltryptophan | 13 responses

• If there were two moons?...

  Asked by WolfFang | 13 responses

• Can anyone recommend a sci-fi book about orbital navigation or orbital warfare?

  Asked by Qingu | 9 responses

• How much does it cost to launch a satellite into space?

  Asked by timtrueman | 19 responses

• Did I just think of a perpetual motion device?

  Asked by jackm | 20 responses

• Where can I find more information on the orbits of planets and moons?

  Asked by Michael | 4 responses

• Why: moons orbit rate = moons rotation rate?

  Asked by toeknee | 8 responses