Which of the following is responsible for heating the bulk of the very hot intercloud gas?
A) high-energy radiation from stars
B) supernovae
C) young O and B stars
D) planetary nebulae
E) The heating is an even mix of all of the sources above.

Question

Quizplus · Accepted Answer

Supernovae are responsible for heating the intercloud gas to temperatures of millions of degrees Celsius. The energy released during supernova explosions heats the surrounding gas and creates shock waves that propagate outwards from the explosion site, heating even more gas as they move through the interstellar medium.

Which of the Following Is Responsible for Heating the Bulk