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Astronomy
John Dallman's user avatar
John Dallman's user avatar
John Dallman's user avatar
John Dallman
  • Member for 8 years, 2 months
  • Last seen this week
  • United Kingdom
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Programmer for a large ISV, SF fan and gamer.

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Top posts
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8
Do the orbits of satellite galaxies show the influence of dark matter?
Jun 13, 2020
question
2
How can a planet's perihelion be raised during migration?
Jun 18
Top network posts
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177
Why didn't the US and USSR jam each other's early-warning radar?
111
Why did the Germans use the Enigma machine rather than the far superior "Lorenz" cipher machine?
110
How was it back then in 1984, when the Apple II had color, and the new Macintosh didn't?
105
How to tell a clone apart?
94
How did the USSR manage to innovate in an environment characterized by government censorship and high bureaucracy?