is the speed of light faster or slower on different planets or is it same

Question: is the speed of light faster or slower on different planets or is it same
- Keywords:
  light,
  planet,
  speed
Asked by 249ghtg37 to Dervil, Moises, Pramod, Saoirse, Stephen on 15 Nov 2016.
- Stephen Davitt answered on 15 Nov 2016:
  
  Well the speed of light technically can vary slightly by the different air it passes through but this change is so small that we never really even say it happens so I guess the answer is that it would change but the difference would be so small that we wouldnt count it to be different

Question: is the speed of light faster or slower on different planets or is it same