1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

If the energy or matter can't be created nor destroyed,does

  1. Feb 8, 2015 #1
    If the energy or matter can't be created nor destroyed but can only be converted from one form to another, does it mean everything including us, used to be stardust or chemicals or whatever that existed right after the big bang?

    Is everything that we use now, are made from the stuff that existed in the universe, right after the big bang? not even a single new atom was created after the big bang?

  2. jcsd
  3. Feb 8, 2015 #2


    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    Yes and no. The main atoms that existed after the big bang were Hydrogen and Helium. These are the primary fuel for stars. All stars use fusion as their power source and one of the byproducts is heavier atoms - atoms that have been 'fused' together to create larger atoms. Stars above a certain size (about 8 times the size of our sun) will eventually explode in a supernova which ejects large amounts of the fusion products like carbon, oxygen, iron, etc. that are part of your body (the hydrogen in your body doesn't have to come from a supernova). This process of stars creating new atoms and the massive ones exploding still continues today.
  4. Feb 8, 2015 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    We are all star stuff. ;)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook