Author Question: Population II stars contain about _____ atoms heavier than helium. A) 0.1 percent B) 0.5 ... (Read 17 times)

rmenurse · **on:** Jul 27, 2018

Population II stars contain about _____ atoms heavier than helium.

A) 0.1 percent
B) 0.5 percent
C) 1.1 percent
D) 2.3 percent

Question 2

Which of the following is true of O and B associations?

A) Their parallax can be easily measured.
B) They are bad spiral tracers.
C) Their distance is usually found by spectroscopic parallax.
D) They reveal parts of six spiral arms near the Sun.