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!

Turning Mars into a Black Hole

  1. Mar 17, 2017 #1
    1. The problem statement, all variables and given/known data
    To what radius do you need to compress Mars in order to turn it into a black hole?

    2. Relevant equations
    None given, but I am mildly familiar with Schwarzschild and his equation. I know that if we double the object's mass, multiply by the universal gravitational constant, and divide the entire thing by the speed of light squared we can technically turn anything into a black hole. In other words:

    Per the text: R=(2GM)/(c^2)

    3. The attempt at a solution
    Obviously I can plug and chug with the equation, but I want to understand WHY this works, and maybe how to derive the equation (if that's even possible at my current understanding). I am fairly unfamiliar with black hole physics, but my instructor thought this would be an interesting problem for us to solve (currently in electromagnetism/thermo).

    Thanks!
     
  2. jcsd
  3. Mar 17, 2017 #2

    gneill

    User Avatar

    Staff: Mentor

    Investigate: escape velocity.
     
  4. Mar 17, 2017 #3
    Ah. So, I should be looking for when the escape velocity of Mars is the speed of light?
     
  5. Mar 17, 2017 #4

    gneill

    User Avatar

    Staff: Mentor

    That's the idea.
     
  6. Mar 17, 2017 #5
    Great, thanks. That connection completely missed me. Appreciate it.

    Edit: Turns out the radius needs to be 0.00094714 meters for Mars to be turned into a black hole!
     
    Last edited: Mar 17, 2017
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: Turning Mars into a Black Hole
  1. Black hole (Replies: 1)

Loading...