Author Question: Where do we find our star on the H-R diagram? A) In the middle of the main sequence B) On the ... (Read 47 times)

Mimi · **on:** Jul 27, 2018

Where do we find our star on the H-R diagram?

A) In the middle of the main sequence
B) On the far left of the main sequence
C) With the red giants
D) On the lower left

Question 2

Is there enough luminous matter to stop the universe's expansion? Is there enough dark matter? What else is there?

What will be an ideal response?

jaykayy05 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

A

Answer to Question 2

There seems to be only about 1-3 of the amount of luminous matter needed to stop the expansion of the universe. With dark matter included, the number comes up to perhaps 20-30 (o = .2-.3 ) of the amount needed, but still not enough. But the dark energy may in fact add in enough to give us a critical universe, with 73 of it in that new form.