Re: How would an Earth-Earth system evolve, different than the Earth-Moon
On Monday, February 24, 2014 3:35:33 AM UTC, ghi...@gmail.com wrote: On Sunday, February 23, 2014 11:39:50 PM UTC, Liz R wrote: They would pull further away, I believe. Tidal drag slows the rotation of the bodies (for example by pulling the ocean out into an ovoid in this case) and conservation of angular momentum requires that their orbits widen as a result. Yo Liz (and Gabriel/Brent) Many thanks for that. It's what I thought given that's the situation with Earth/Moon,. But then I kept thinking about the bulking crusts and oceans as shortening the distance bnetween them By the way, Stating a personal position I think the collision that left the Earth-Moon system behind is fundamental in the history that we got, that worked out so good for the prospects of the luscious green curly kind of life. ' The idea is well out there, so it'll unlikely be the first you've heard. Which means you might have a view of your own. I should be interested to hear. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
How would an Earth-Earth system evolve, different than the Earth-Moon
I was just trying to imagine the effect two equal oceans, one on each objechave? The ocean puts a heavy brake on the rotation of Earth and has already tidally locked the moon. But what tidal drag went both .ways? Would the planets start moving toward eachother, or pull further away? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would an Earth-Earth system evolve, different than the Earth-Moon
They would pull further away, I believe. Tidal drag slows the rotation of the bodies (for example by pulling the ocean out into an ovoid in this case) and conservation of angular momentum requires that their orbits widen as a result. On 24 February 2014 09:14, ghib...@gmail.com wrote: I was just trying to imagine the effect two equal oceans, one on each objechave? The ocean puts a heavy brake on the rotation of Earth and has already tidally locked the moon. But what tidal drag went both .ways? Would the planets start moving toward eachother, or pull further away? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would an Earth-Earth system evolve, different than the Earth-Moon
IIUC, the Moon is tidally locked to the Earth because it was initially a bit molten and due to Earth's gravity was an elongated ball shape, not quite a sphere. Then it cooled down and solidified that way. The tug of gravity keeps the Moon's bulge pointed toward us, braking the rotation of the Earth, transferring the angular momentum to the Moon which makes it move farther away. It tugs the oceans, too, but I think that effect is smaller. An Earth-Earth system with rounder planets wouldn't have to be tidally locked, I think. Even so, the oceans on both planets would still make tidal drag on both planets so the lost angular velocity, conserving angular momentum, would mean they'd still pull farther away from each other. On Sunday, February 23, 2014 2:14:40 PM UTC-6, ghi...@gmail.com wrote: I was just trying to imagine the effect two equal oceans, one on each objechave? The ocean puts a heavy brake on the rotation of Earth and has already tidally locked the moon. But what tidal drag went both .ways? Would the planets start moving toward eachother, or pull further away? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would an Earth-Earth system evolve, different than the Earth-Moon
On 2/23/2014 4:19 PM, Gabriel Bodeen wrote: An Earth-Earth system with rounder planets wouldn't have to be tidally locked, I think. Rounder planets wouldn't matter. Planets are not rigid bodies, so changing gravitational forces (as by a nearby body) changes the shape of the planet. It doesn't have to be 'molten'. Brent -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
Re: How would an Earth-Earth system evolve, different than the Earth-Moon
On Sunday, February 23, 2014 11:39:50 PM UTC, Liz R wrote: They would pull further away, I believe. Tidal drag slows the rotation of the bodies (for example by pulling the ocean out into an ovoid in this case) and conservation of angular momentum requires that their orbits widen as a result. Yo Liz (and Gabriel/Brent) Many thanks for that. It's what I thought given that's the situation with Earth/Moon,. But then I kept thinking about the bulking crusts and oceans as shortening the distance bnetween them On 24 February 2014 09:14, ghi...@gmail.com javascript: wrote: I was just trying to imagine the effect two equal oceans, one on each objechave? The ocean puts a heavy brake on the rotation of Earth and has already tidally locked the moon. But what tidal drag went both .ways? Would the planets start moving toward eachother, or pull further away? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-li...@googlegroups.com javascript:. To post to this group, send email to everyth...@googlegroups.comjavascript: . Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
