What is the core temperature of the nearest planet to the sun?

Question: What is the core temperature of the nearest planet to the sun?
- Keywords:
  core,
  temperature
Asked by Jakey to Ajay, Kate, Kuntal, Pip, Reka on 8 Nov 2016.
- Reka Nagy answered on 8 Nov 2016:
  
  We can’t calculate this directly, but we can estimate it. Mercury, which is closest to the sun, has a relatively cool core, about 2200 Celsius, or 4000 Fahrenheit, and it is probably completely solid – but we aren’t completely sure about that yet!

Question: What is the core temperature of the nearest planet to the sun?