Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B Earth may owe its birth to a solar eruption

  1. May 8, 2017 #1
    Earth may have been born in a huge flare-up of the young sun

    by Ken Croswell

    It’s not easy to make Earth. Most of the explanations for how our planet formed have troubling problems. But if a new idea is right, we can thank a hyperactive young sun for Earth’s existence, plus solve a long-standing mystery about Mars.

    Read more at New Scientist .
     
  2. jcsd
  3. May 9, 2017 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    The explanation for Mars sounds odd. Sticking together is only relevant at sizes of at most a few kilometers (and most important before the meter-size barrier), afterwards gravity takes over. Mars is larger than that, so something did form.

    I had a look at the original research paper. Less sticky material would reduce the number of planetesimals and make the process of their formation slower. Both gives the remaining dust more chance to escape.
     
  4. May 9, 2017 #3
    It seems to me that the reason why Mars is small is because Jupiter is big.
    Mars sort of 'got lucky' to not end up not being just another moon of Jupiter,
     
  5. May 12, 2017 #4
    As the New Scientist article states, the standard theory concerning Mars--going all the way back to 1755--is that the planet is small because of Jupiter.

    But in the new theory, Mars is small because the solar flare-up didn't heat dust grains at its position much, so they didn't stick together much, so they could form only a planet much smaller than Earth.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Earth may owe its birth to a solar eruption
Loading...