If interstellar objects originate in protoplanetary disks, they can be used to calibrate the fraction of mass that such disks eject. The discoveries of interstellar objects 1I/`Oumuamua and 2I/Borisov, taken together with rogue planets statistics, allow for the calibration of mass locked in...
Dynamical Avenues for Mercury's Origin. I. The Lone Survivor of a Primordial Generation of Short-period Protoplanets
The absence of planets interior to Mercury continues to puzzle terrestrial-planet formation models, particularly when contrasted with the relatively high derived occurrence rates of short-period planets around Sun-like stars. Recent work proposed that the majority of systems hosting hot...
The hypothetical impact by Theia deposited extra iron and other heavy matter, whereby the lighter matter vaporized and escaped. Much of the lighter surface levels went into orbit forming one or two moons, though the two moon idea would soon combine into today’s Moon.Why is Earth so dense in our solar system ?
Logic would make Mercury most dense.
Yes, this seems to be the mainstream view of how Earth had more iron core (by ratio) for its mass than any other planet. This theory also explains many of the unusual features found on the Moon, especially the Two-Moon hypothesis that resulted from the Theia impact but later formed into one moon.Would it be a fair summary to suggest that Earth has a higher density because it gained more metallic core from the Theia collision,...
I don't know, or have forgoten, the Mercury explanation. It is logical, however, that protplanets during formation closer to the Sun would always consist of the heavier elements/molecules due to the Sun's radiation effects. Heavier molecules become more volitale with temperature, thus the lighter elements will escape from the disk region where a protoplanet like Mercury forms....whereas Mercury has a high density because its collision(s) caused loss of (silicate) mantle.
Earth gained core - Mercury lost mantle? Both increased in density differently?
Yes, I agree. Didn't we crunch some numbers not too long ago and discovered that they could hold their H & He elements in their atmospheres for a very long time, IIRC?Helio, I agree. I know Hot Jupiters must be formed further out, but:
" It is logical, however, that proto planets during formation closer to the Sun would always consist of the heavier elements/molecules due to the Sun's radiation effects. ". . . . . . . . .
But I do marvel at how they seem to hold onto so much H and He when really close to a star - comparatively within Mercury's orbit.
That's a nice article. Perhaps the best description I've heard of the early planetary dynamics is that of a pinball machine. The best planetary formation model for the solar system seems to be the Nice model (a French town, I think) that has all kinds of wanderings and interactions with planets. But it's not a complete model since it can't seem to quite explain the orbits of the outer planets, or maybe it was only Pluto it had trouble with, not sure.Mercury:
Scientists theorize that one such object slammed into young Earth to produce our planet's moon. "Collisions were frequent during the early stages of the solar system's formation," Chau said. ... This scenario more often formed a Mercury-like object in their simulations — as long as it didn't destroy the planet completely.23 Oct 2018
How Did an Oddball Planet Like Mercury Form? | Space
Planet Mercury a result of early hit-and-run collisions
https://www.sciencedaily.com › releases › 2014/07
8 Jul 2014 — According to a study published online in Nature Geoscience July 6, Mercury and other unusually metal-rich objects in the solar system may be ...
Yes, I just found this NASA site that made me do a double-take. Jupiter's core could be as hot as 24,000K! That's a lot hotter than the Sun's surface!I tend to forget how hot the inner parts of Hot Jupiters can get - and the consequent/causative high pressures.
Cat, do the Nice model or Grand Tack model, explain the origin of the planets Mercury to Mars from the tiny dust grains to full grown planets we see today?A little more reading so as not to fleece the peace getting grease from bees.
When was the nice model developed?
Around 2004 a team of scientists met in Nice, France and developed a new theory as to how the early solar system developed.30 Sept 2020
What Is the Nice Model, or How Did Our Solar System Form?
https://owlcation.com › stem › What-Is-The-Nice-Model
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What does the grand tack theory attempt to explain?
Did Uranus and Neptune switch places?