Date: 24/02/2017 11:54:48
From: Spiny Norman
ID: 1029701
Subject: re: NASA announces seven ‘Earths’ found around one star, TRAPPIST-1

mollwollfumble said:


Spiny Norman said:

Sure point noted over Saturn’s various moons and there’s certainly some orbital resonance going on, but oly one of Saturn’s Moons (Titan) is big enough to be close to being called a planet. There’s seven planet-sized bodies orbiting around Trappist-1.
It just seems odd to me that such (relatively) massive bodies can orbit so (relatively) closely and be fairly stable.

What seems seriously odd to me is the combinations of rings and moons in our own solar system. How are the waves in Saturn’s rings that are generated by moons such a Diane and Prometheus damped out so rapidly without introducing instabilities?

Why do we find moons and rings both inside and outside the Roche limit for each planet? Rings are only supposed to be formed within the Roche limit and moons outside.

Where do the spokes in Saturn’s rings come from?

Those are the stability questions that bother me.

My best theory is that the universe we see is just the alpha version. The final version will make a lot more sense.

But seriously, yes, there’s a lot to learn about how all this works, ta.

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