Nuclear reactions in stars manufacture energy and heavy atoms under the supervision of a natural ...

Nuclear reactions in stars manufacture energy and heavy atoms under the supervision of a natural thermostat.
 
  Indicate whether the statement is true or false

Question 2

Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by the proton-proton chain.
 
  Indicate whether the statement is true or false

Question 3

Emission nebulae are produced when a hot star excites the gas near it to produce an emission spectrum.
 
  Indicate whether the statement is true or false

Question 4

It is a misconception to imagine that space is empty-a vacuum.
 
  Indicate whether the statement is true or false

Question 5

Convection is a mode of energy transport between materials that requires close contact between the atoms.
 
  Indicate whether the statement is true or false

Question 6

A stable group of stars that formed and are held together by their combined gravity is called a stellar association.
 
  Indicate whether the statement is true or false