Author Question: A star system where we observe the magnitude to increase and decrease is a(n) ________. Fill in ... (Read 26 times)

mia · **on:** Jul 27, 2018

A star system where we observe the magnitude to increase and decrease is a(n) ________.

Fill in the blank(s) with correct word

Question 2

The Galactic Year is the time for our solar system to orbit the Galaxy; it is about

A) 15 million years.
B) 225 million years.
C) 4.5 billion years.
D) 9.6 billion years.
E) 13.5 billion years.