What Powers the Sun

Q43: All main-sequence stars are composed primarily of

Q44: The _ was the formation of helium

Q45: Astronomers believe that a _ must lie

Q46: What is a parsec?

Q47: The radiation emitted by stars, galaxies, and

Q49: What are main-sequence stars composed of primarily?

Q50: When we look at close objects, we

Q51: The cosmic background radiation is _ radiation

Q52: Population II stars are originally composed of

Q53: Neutron stars are _.<br>A) dense stars where