Author Question: What percentage of a molecular cloud's mass is interstellar dust? A) 1 B) 2 C) 28 D) 50 E) ... (Read 50 times)

SAVANNAHHOOPER23 · **on:** Jul 27, 2018

What percentage of a molecular cloud's mass is interstellar dust?

A) 1
B) 2
C) 28
D) 50
E) 1-50, depending on the mass of the molecular cloud

Question 2

Based on the frequency with which we see comets from Earth, astronomers estimate the total number of comets in the solar system to be

A) 100 million.
B) 1 billion.
C) 10 billion.
D) 100 billion.
E) 1 trillion.