how hot is the centere of the earth?

Question: how hot is the centere of the earth?
- Keywords:
  earth,
  heat,
  temperature
Asked by sebisepic to Jen, Jill, Mel, Phil, Stef on 18 Mar 2013.
- Jill Magee answered on 18 Mar 2013:
  
  The centre of the earth is around 4000 degrees centigrade we THINK. We’ve not managed to directly measure it so we’ve had to work it out using the knowledge we have.

Question: how hot is the centere of the earth?