Author Question: _____ is the location in the H-R diagram where stars first reach stability as hydrogen-burning ... (Read 16 times)

j.rubin · **on:** Jul 27, 2018

_____ is the location in the H-R diagram where stars first reach stability as hydrogen-burning stars.

A) The proton-proton chain
B) The carbon-nitrogen-oxygen cycle
C) The zero-age main sequence
D) The interstellar medium region

Question 2

The Sun fuses _____ hydrogen nuclei to make one helium nucleus.

A) two
B) three
C) four
D) five