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Jupiter Used to Be Four Times Farther from the Sun, Study Claims
Populat Mechanics ^ | Mar 25, 2019 | By Avery Thompson

Posted on 03/26/2019 9:33:56 AM PDT by BenLurkin

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To: colorado tanker
Thanks colorado tanker. Here's some old stuff I've posted here and there before, it's likely that most or all are dead links, but I didn't check 'em. Probably would show up somewhere in a full web search. Will do my pingin' later.
Did Jupiter Bully Other Planets in Sibling Rivalry?
by Robert Roy Britt
8 December 1999
One possible explanation, discussed in Thursday's issue of the journal Nature, is that Uranus and Neptune formed much closer to the center of the action than their current positions might indicate. In this scheme, Jupiter and Saturn were bullies of a protoplanetary playground, shoving the other two future giants out of the way.
Jupiter gave birth to Uranus and Neptune
by Dr David Whitehouse
8 December 1999
Not too long ago, scientists regarded the orbits that the planets circle our Sun as being the ones they were born in. Now they are realising that this is not the case. Uranus and Neptune may have migrated outwards and Jupiter may have come in from the outer cold. Scientists have always been slightly puzzled by the positions of Uranus and Neptune because in their present locations it would have taken longer than the age of the Solar System for them to form. Scientists from Queen's University suggest that the four giant planets started out as rocky cores in the Jupiter-Saturn region, and that the cores of Uranus and Neptune were tossed out by Jupiter's and Saturn's gravity.
Jupiter's Composition Throws Planet-formation Theories into Disarray
by Robert Roy Britt
Nov 17 1999
Examining four-year-old data, researchers have found significantly elevated levels of argon, krypton and xenon in Jupiter's atmosphere that may force a rethinking of theories about how the planet, and possibly the entire solar system, formed. Prevailing theories of planetary formation hold that the sun gathered itself together in the center of a pancake-shaped disk of gas and dust, then the planets begin to take shape by cleaning up the leftovers. In Jupiter's current orbit, 5 astronomical units from the sun, temperatures are too warm for the planetesimals to have trapped the noble gases. Only in the Kuiper belt -- a frigid region of the solar system more than 40 AU from the sun -- could planetesimals have trapped argon, krypton and xenon.

While lead researcher Tobias Owen does not put much stock in the idea that Jupiter might have migrated inward to its present position, other scientists on the team say the idea merits consideration. Owen expects the probes will find similarly high levels of noble gases in Saturn, Uranus and Neptune. Hints of these gases have even been found in the thick atmosphere of Venus, another planet now begging more study.
Newfound Moons Tell Secrets of Solar System
by Henry Fountain
August 12, 2003
The fact that most of the satellites' orbits are retrograde and eccentric speaks volumes about their origins: They had to have come from elsewhere, and been captured by the planets at some point. If they formed at the same time as the planets, from the spinning nebular disk, their orbits would be nearly circular and in the same direction as the planets' rotation, like the "regular" moons... In the case of the irregular satellites, they could not have shifted from an orbit around the Sun to an orbit around one of the giant planets without slowing down -- through friction in an atmosphere, perhaps; the influence of gravity; or a collision with another object... But there are two other possibilities for capture, Dr. Nesvorny said. One is that rapid growth of the core led to a corresponding increase in gravity, enough to pull down a nearby object. The other is that captured objects were a result of a collision between two planetesimals, the force of the collision being enough to dissipate the energy of at least one of them. Either of these two theories may be a more likely explanation for the satellites of Uranus and Neptune, which formed differently from Jupiter and Saturn, without the large amounts of gas.
Retrograde satellites lose momentum to the parent body and slowly spiral inward, which puts an upper limit on the length of time the retrograde moons have spent as satellites, and obviously, will spend as satellites.
Planet Formation In Hundreds Of Years?
James Hogan
Posted on January 27, 2003
The British astronomer W.H. McCrea concluded in the '60s, as others have since, that minor planets could not form by accretion inside the orbit of Jupiter because of its disruptive tidal effects, and R.A. Lyttleton showed in a fluid dynamic analysis of Jupiter's core that its rotation and accretion rates would cause it to become periodically unstable and fission to throw off excess mass. We're told that the gas giants don't have rock cores, but that has always struck me as preposterous, since even if they formed from pure gaseous concentrations initially, bodies of that size would surely attract heavier material thereafter. So conceivably gas giants formed rapidly in the way the Pittsburgh simulation depicts represent the first phase of a process that accumulates fast-spinning cores of heavier material that gets compressed down to rocky densities, and ejects them as a planet and comet factory.

41 posted on 03/26/2019 9:29:33 PM PDT by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie)
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Doctor Fun David Farley Charles Darwin Intelligent Designer

42 posted on 03/26/2019 10:21:54 PM PDT by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie)
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To: colorado tanker; 75thOVI; Abathar; agrace; aimhigh; Alice in Wonderland; AnalogReigns; AndrewC; ...
Thanks colorado tanker, and thanks BenLurkin for posting the topic.



43 posted on 03/27/2019 12:57:45 AM PDT by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie)
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To: SunkenCiv

Well, what do you know. Other studies placed the gas giants closer to the sun and migrated outwards. Hummmm.


44 posted on 03/27/2019 2:29:39 AM PDT by vannrox (The Preamble to the Bill of Rights - without it, our Bill of Rights is meaningless!)
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To: SunkenCiv

Jupiter certainly seems to have played a vital role as to where Earth ended up and continuing to protect us from dangerous neighbors. Maybe there aren’t so many Class M planets after all.


45 posted on 03/27/2019 11:50:13 AM PDT by colorado tanker
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To: sparklite2

Farmers space Insurance. They’ve seen a planetary collision or two.


46 posted on 03/27/2019 6:31:28 PM PDT by Redcitizen
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To: colorado tanker
The late TVF claimed that Jupiter would clear the solar system of debris from his hypothesized exploding planets in about 10 million years. The truth is, Earth isn't protected at all, other than by sheer distances. And a rock about a mile across (and probably smaller) would end civilization and kill off more than 90% of the human race.. Also, large bodies (Jupiter or larger) comprised the bulk of the early exoplanet discoveries, but with the resolution of the newer instruments, the number of smaller planets has risen.

47 posted on 03/27/2019 10:45:53 PM PDT by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie)
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To: SIDENET

Illegal Aliens’ caravan commandeered Jupiter and are riding it toward our planet now.

.


48 posted on 03/27/2019 10:57:00 PM PDT by repentant_pundit (http://www.LibertyLifeboat.org)
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To: Redcitizen

LOL


49 posted on 03/28/2019 1:06:44 PM PDT by sparklite2 (Don't mind me. I'm just a contrarian.)
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To: Fightin Whitey

“Predicted to make contact with Uranus!”
Yup, and it will be a sneak attack from the rear.


50 posted on 03/28/2019 2:14:40 PM PDT by BatGuano (Ya don't think I'd go into combat with loose change in my pocket, do Ya?)
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