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Groups > sci.physics > #506369 > unrolled thread
| Started by | The Starmaker <starmaker@ix.netcom.com> |
|---|---|
| First post | 2015-07-11 11:57 -0700 |
| Last post | 2015-07-12 21:51 -0700 |
| Articles | 3 on this page of 23 — 10 participants |
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Two Earths The Starmaker <starmaker@ix.netcom.com> - 2015-07-11 11:57 -0700
Re: Two Earths Simoen <invalid@invalid.com> - 2015-07-11 16:01 -0500
Re: Two Earths Sam Wormley <swormley1@gmail.com> - 2015-07-11 18:32 -0500
Re: Two Earths Simoen <invalid@invalid.com> - 2015-07-11 19:55 -0500
Re: Two Earths benj <nobody@gmail.com> - 2015-07-11 21:46 -0400
Re: Two Earths benj <nobody@gmail.com> - 2015-07-11 22:02 -0400
Re: Two Earths HVAC <Mr.HVAC@gmail.com> - 2015-07-12 04:59 -0400
Re: Two Earths "a425couple" <a425couple@hotmail.com> - 2015-07-12 11:14 -0700
Re: Two Earths "Bast" <fakename@nomail.invalid> - 2015-07-12 22:24 -0400
Re: Two Earths HVAC <Mr.HVAC@gmail.com> - 2015-07-13 05:50 -0400
Re: Two Earths The Starmaker <starmaker@ix.netcom.com> - 2015-07-12 15:46 -0700
Re: Two Earths Simoen <invalid@invalid.com> - 2015-07-12 21:34 -0500
Re: Two Earths Mike Duffy <see_website@signature.block> - 2015-07-12 22:49 -0400
Re: Two Earths benj <nobody@gmail.com> - 2015-07-13 01:00 -0400
Re: Two Earths HVAC <Mr.HVAC@gmail.com> - 2015-07-13 05:52 -0400
Re: Two Earths benj <none@gmail.com> - 2015-07-13 13:51 -0400
Re: Two Earths HVAC <Mr.HVAC@gmail.com> - 2015-07-13 14:41 -0400
Re: Two Earths Hägar <hsahm@yahoo.com> - 2015-07-13 17:19 -0700
Re: Two Earths benj <nobody@gmail.com> - 2015-07-14 00:35 -0400
Re: Two Earths HVAC <Mr.HVAC@gmail.com> - 2015-07-14 06:22 -0400
Re: Two Earths Simoen <invalid@invalid.com> - 2015-07-13 00:24 -0500
Re: Two Earths Mike Duffy <see_website@signature.block> - 2015-07-13 11:07 -0400
Re: Two Earths The Starmaker <starmaker@ix.netcom.com> - 2015-07-12 21:51 -0700
Page 2 of 2 — ← Prev page 1 [2]
| From | Simoen <invalid@invalid.com> |
|---|---|
| Date | 2015-07-13 00:24 -0500 |
| Message-ID | <mnvi2c$d9r$1@speranza.aioe.org> |
| In reply to | #506658 |
On 7/12/2015 9:49 PM, Mike Duffy wrote: > On Sun, 12 Jul 2015 21:34:40 -0500, Simoen wrote: > >> well, you admit you are not a god, the real question is why did god put >> an exact duplicate Earth, exactly on the opposite side of the sun from us? > > It cannot be an exact duplicate of this Earth, because this one follows > well-established gravitational attraction laws regarding its orbital > positioning. > > Any planet exactly opposite our position would violate known gravitational > laws. (i.e. Kepler's etc.) > > https://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion > keplers laws apply to two body systems, the earth/sun/earth is two, two body systems not sure how that would really work out, probably not, go unstable and eventually earth 1 would wack earth 2..... came from that movie
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| From | Mike Duffy <see_website@signature.block> |
|---|---|
| Date | 2015-07-13 11:07 -0400 |
| Message-ID | <1p5jtuok68pvt$.dlg@mduffy.eternal-september.org> |
| In reply to | #506676 |
On Mon, 13 Jul 2015 00:24:26 -0500, Simoen wrote: > Keplers laws apply to two body systems, the earth/sun/earth is > two, two body systems. > > not sure how that would really work out, You are correct. I mis-identified the appropriate "law". Newton's law (and ultimately Einsteinian relativity) describe gravitation. As you point out, Kepler's equations are only the restricted two-body description which solves Newtonian gravity to yield a time-based prediction of a planetary orbit. Orbital perturbation theory is very complex. Orbital positions of three or more bodies are impossible to solve analytically, but we can make generalizations for how major orbital elements will evolve over time when one object in the system (i.e. the Sun) is much more massive than the planets, as is the case with the solar system. Orbits of all planets are affected by other ones. But changes to orbital elements will be much more pronounced in the smaller planets. If there were a duplicate Earth exactly opposite us in our orbit, the time humans have been observing planets would have been sufficient for its orbit to be perturbed by Jupiter and Saturn to the point where we would be able to see it by now. -- http://pages.videotron.com/duffym/index.htm
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| From | The Starmaker <starmaker@ix.netcom.com> |
|---|---|
| Date | 2015-07-12 21:51 -0700 |
| Message-ID | <55A343BF.7D8A@ix.netcom.com> |
| In reply to | #506652 |
Simoen wrote: > > On 7/12/2015 5:46 PM, The Starmaker wrote: > > The Starmaker wrote: > >> > >> There is a reason why > >> there is only one Earth > >> in our solar system.. > >> if there were two > >> we would be > >> too occupied > >> with killing them all. > >> > >> Or they would be > >> too occupied > >> with eating us all.. > >> alive. > >> > >> Or... > > > > > > If I was God, I could't think of a reason Why to have a second Earth. > > > > There is simply no reason to. > > > > > > Not only is there no good reason to have a second earth in our solar system... > > but not in any other solar system...or anywhere else in the universe. > > > > > > > > There is simply no good reason. > > > > > > I cannot think of any...and I know better than the rest of yous. > > > > > > The Starmaker > > > > well, you admit you are not a god, the real question is why did god put > an exact duplicate Earth, exactly on the opposite side of the sun from us? I didn't admit I'm not a god, ...i wrote: "If I was God". Meaning, if I was God, the creator of Earth... I din't create the earth as far as I can remember.... and I have no knowledge of any other earths....hiding.
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