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Jun 20, 2015 at 12:37 comment added Hot Licks Tidal forces are complex. If you have one body orbiting another larger one in isolation the two will "want" to "sync" such that the rotation rate of the large body matches the orbital rate of the small body -- this is happening between Earth and the Moon. But with the Earth and the Sun there are also the other planets involved, and they are mostly moving slower and will tend to slow down Earth's orbit.
Jun 20, 2015 at 5:01 comment added userLTK I know it's just Wiki, but I don't think that's true. - source: en.wikipedia.org/wiki/Tidal_acceleration Also, this. It's hard to predict because the other planets play a role. en.wikipedia.org/wiki/Future_of_the_Earth "The incremental effect of gravitational perturbations between the planets causes the inner Solar System as a whole to behave chaotically over long time periods." If the Earth and Sun were alone in the solar system as a 2 body system, the earth would gradually move away, not towards the sun.
Jun 20, 2015 at 1:05 comment added Hot Licks @userLTK - "Tidal forces" will eventually cause any planet's orbit to decay, unless it can siphon energy off another body (causing that body's orbit/rotation to decay).
Jun 19, 2015 at 7:35 comment added userLTK Why is the Earth's orbit decaying? I've not heard that, nor could I find a good source to back it up just now. I agree with you on the expanding sun.
Jan 16, 2015 at 21:32 history edited user889 CC BY-SA 3.0
added in links to articles as per comments
Jan 16, 2015 at 20:41 history edited Hot Licks CC BY-SA 3.0
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Jan 16, 2015 at 17:53 comment added vsz Destroy or prevent... it can go both ways.
Jan 16, 2015 at 17:26 review First posts
Jan 16, 2015 at 17:36
Jan 16, 2015 at 17:21 history answered Hot Licks CC BY-SA 3.0