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

Are some shadows darker and colder than others?

  1. Jan 5, 2012 #1
    What is the evidence for the existence of a whitehole?

    Other than theoretical ones, are there any observational proofs?
     
    Last edited: Jan 5, 2012
  2. jcsd
  3. Jan 5, 2012 #2
    That shadow on degobah was like really cold just ask luke skywalker so yes some shadows are colder than others
     
  4. Jan 5, 2012 #3

    Drakkith

    User Avatar

    Staff: Mentor

    Whoa, I think this thread was edited and changed...
    Anyways, there is zero evidence of the existance of white holes.
     
  5. Jan 5, 2012 #4
    Of course, there's zero direct evidence for black holes as well. At most astronomers know that there are gravitational systems whose center must have an enormous mass (enough, according to GR to be a black hole) and that the center has no detectable emissions.
     
  6. Jan 6, 2012 #5

    Drakkith

    User Avatar

    Staff: Mentor

    I guess that depends on what you consider direct evidence to be.
     
  7. Jan 6, 2012 #6
    Well all we have now is a null result, it's NOT a big star at the center of a galaxy. But hallmarks of black holes specifically, things like Hawking radiation and such, have never been detected.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook