Author Question: A star of spectral type O lives approximately how long on the main sequence? A) 1,000 years B) ... (Read 107 times)

fasfsadfdsfa · **on:** Jul 27, 2018

A star of spectral type O lives approximately how long on the main sequence?

A) 1,000 years
B) 10,000 years
C) 10 million years
D) 100 million years
E) 1 billion years

Question 2

Venus is only a little bit (5) smaller than Earth, and its density is only slightly less than Earth's. Therefore, its mass is:

A) the same as Earth's.
B) just a little bit greater than Earth's.
C) much greater than Earth's (more than 20 different).
D) just a little bit less than Earth's.
E) much less than Earth's (more than 20 different).