Author Question: Identify a true statement about main-sequence stars. A) They balance their gravity by fusing ... (Read 59 times)

tiara099 · **on:** Jul 27, 2018

Identify a true statement about main-sequence stars.

A) They balance their gravity by fusing hydrogen.
B) They generate energy by breaking uranium isotopes.
C) They do not increase in size as they consume their fuel.
D) They do not undergo any molecular change during their life spans.

Question 2

When the nuclear reactions begin making too much energy in a star, by virtue of the natural thermostat, the star:

A) would expand slightly.
B) would increase its central temperature.
C) would increase its density.
D) would reduce the mass by a factor of 0.5.