Author Question: During the hydrogen shell burning phase: A) the star grows more luminous. B) the star becomes ... (Read 177 times)

BRWH · **on:** Jul 27, 2018

During the hydrogen shell burning phase:

A) the star grows more luminous.
B) the star becomes less luminous.
C) helium is burning in the core.
D) the core is expanding.
E) hydrogen is burning in the central core.

Question 2

The Drake equation now tells us that the number of technological civilizations in our Galaxy at this time is:

A) only our own.
B) five to ten at most.
C) perhaps 3,000.
D) millions.
E) not known; insufficient data to compute.