Could it be that the origin of Uranus is different from the rest of the Solar system?

The planet Uranus is odd and mysterious because it has almost no heat coming from its interior. It's also odd because of its huge axial tilt of 98 degrees.

Could it be that the origin of Uranus is different from the rest of the Solar system?

I'm thinking that Uranus could be several billion years older than the rest of the Solar system. With such an age, its primordial radioactive components would have long ago converted to non-radioactive atoms. It would still have heat from its gravity though. I don't know how much that component would be. Jupiter is still compacting from gravity. Perhaps Uranus' compacting is mostly finished long ago.

The orbital eccentricity of Uranus is not large, so it might not be a captured planet, but if it arrived very early in the formation of the Solar system, it might have been assimilated without much eccentricity.

5 Answers

  • Anonymous
    8 months ago
    Favourite answer

    Uranus is 3% larger than Neptune in diameter, but Neptune is 18% larger in mass. All this suggests to me is that Uranus has a much less massive core at its center. Neptune is 30% denser than Uranus. With a less massive core, it would thus have much less radioactives in its core, and thus much less heat coming out. Doesn't require an alien world hypothesis to explain any of that.

    Also another problem with the alien world hypothesis is that if it were a fully formed planet from another solar system getting captured by our nascent solar system, it would become one of the most massive planets in our solar system, because it would have had a massive head start. It would start vacuuming up all of the debris ahead of all of the other planets that have not yet formed here, and thus become a rival to Jupiter, if not perhaps even something even larger like a brown dwarf.

  • 8 months ago

    Nope. All the planets developed from the same source and about the same time. They all just evolved differently,

  • Clive
    Lv 7
    8 months ago

    None of that is any indication that it's older than other planets.

  • Unlike the other planets of the solar system, Uranus is tilted so far that it essentially orbits the sun on its side, with the axis of its spin nearly pointing at the star. This unusual orientation might be due to a collision with a planet-size body, or several small bodies, soon after it was formed

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  • 8 months ago

    No, very likely Uranus was NOT made differently from the other planets or at a different time. The reason Uranus is scold is that very likely mist of its outer liquid cors has cooled off enough and crystallized. Radioactivity provided only 14% of the heat from Earth's core.. Uranus has a much stronger global magnetic field than Earth's. That means iron nickel and sulfur are still molten enough to convect and conduct heat in the outer cord to create that global magnetic field.

    Mars outer core had cooled off and crystallized enough that Mars no longer has a global magnetic field. Mars also has much thinner insulating mantle and crust than Early has, so it has cooled off faster.

    It is possible that thee terrestrial planets may be second generation planets and are much younger than the gas and ice giants, so their cores are younger and hotter.

    Source(s): "How the Universe Works" shows.
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