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to me, the story doesnt make a lot of sense. all around the universe big rocky giants moved inwards and suddenly became gas giants of the inner solar system, b

by autokad 12y ago

to me, the story doesnt make a lot of sense. all around the universe big rocky giants moved inwards and suddenly became gas giants of the inner solar system, but in ours for some reason Jupiter got big and gracious and it blocked Neptune and Uranus, and more perhaps. I dont buy it, i think what others have said, that jupiter was pulled out from the inner solar system along with the other large gas giants. and that earth might have been a super earth, but its collision that created the moon threw large portions into outer space. this 2nd hypothesis makes more sense, especially when you consider that earth is unusually dense. we should have been a larger planet, were like the denser core of something else left behind. Much denser then even venus or mars.

dalke 12y ago
The tricky part is that the techniques for detecting extra-solar planets work best for large planets near its sun. But to get to your question, see http://en.wikipedia.org/wiki/Orbital_resonance#Possible_past_mean-motion_resonances http://en.wikipedia.org/wiki/Orbital_resonance#Possible_past... : > A past resonance between Jupiter and Saturn may have played a dramatic role in early Solar System history. A 2004 computer model by Alessandro Morbidelli of the Observatoire de la Côte d'Azur in Nice suggested that the formation of a 1:2 resonance between Jupiter and Saturn (due to interactions with planetesimals that caused them to migrate inward and outward, respectively) created a gravitational push that propelled both Uranus and Neptune into higher orbits, and in some scenarios caused them to switch places, which would have doubled Neptune's distance from the Sun. The resultant expulsion of objects from the proto-Kuiper belt as Neptune moved outwards could explain the Late Heavy Bombardment 600 million years after the Solar System's formation and the origin of Jupiter's Trojan asteroids.[43] An outward migration of Neptune could also explain the current occupancy of some of its resonances (particularly the 2:5 resonance) within the Kuiper belt. I think your statement "that earth is unusually dense" is incorrect. Earth's density is 5.51 grams/cc and Mercury's is 5.427 grams/cc. These are quite close. Earth's density is higher because of its higher gravity. When considered as "uncompressed" density, Mercury is much more dense than the Earth. See http://en.wikipedia.org/wiki/Terrestrial_planet#Density_trends http://en.wikipedia.org/wiki/Terrestrial_planet#Density_tren... .
- oinksoft 12y ago
  > I think your statement "that earth is unusually dense" is incorrect [..] Mercury is much more dense than the Earth. To be fair, Mercury's basically a ball of iron.

by autokad 12y ago

dalke 12y ago

The tricky part is that the techniques for detecting extra-solar planets work best for large planets near its sun. But to get to your question, see http://en.wikipedia.org/wiki/Orbital_resonance#Possible_past_mean-motion_resonances http://en.wikipedia.org/wiki/Orbital_resonance#Possible_past... : > A past resonance between Jupiter and Saturn may have played a dramatic role in early Solar System history. A 2004 computer model by Alessandro Morbidelli of the Observatoire de la Côte d'Azur in Nice suggested that the formation of a 1:2 resonance between Jupiter and Saturn (due to interactions with planetesimals that caused them to migrate inward and outward, respectively) created a gravitational push that propelled both Uranus and Neptune into higher orbits, and in some scenarios caused them to switch places, which would have doubled Neptune's distance from the Sun. The resultant expulsion of objects from the proto-Kuiper belt as Neptune moved outwards could explain the Late Heavy Bombardment 600 million years after the Solar System's formation and the origin of Jupiter's Trojan asteroids.[43] An outward migration of Neptune could also explain the current occupancy of some of its resonances (particularly the 2:5 resonance) within the Kuiper belt. I think your statement "that earth is unusually dense" is incorrect. Earth's density is 5.51 grams/cc and Mercury's is 5.427 grams/cc. These are quite close. Earth's density is higher because of its higher gravity. When considered as "uncompressed" density, Mercury is much more dense than the Earth. See http://en.wikipedia.org/wiki/Terrestrial_planet#Density_trends http://en.wikipedia.org/wiki/Terrestrial_planet#Density_tren... .

oinksoft 12y ago
> I think your statement "that earth is unusually dense" is incorrect [..] Mercury is much more dense than the Earth. To be fair, Mercury's basically a ball of iron.