A 100 million-year-old open cluster will no longer contain any ...

[j.rubin]

A 100 million-year-old open cluster will no longer contain any O-type stars.
 
  Indicate whether the statement is true or false

Question 2

What do we mean when we say that the rotation curve for a spiral galaxy is flat?
 
  A) Gas clouds orbiting far from the galactic center have approximately the same orbital speed as gas clouds located further inward.
  B) The amount of light emitted by stars at different distances is about the same throughout the galaxy.
  C) All the galaxy's mass is concentrated in its flat, gaseous disk.
  D) The disk of a spiral galaxy is quite flat rather than spherical like the halo.

[emilymalinowski12]

Answer to Question 1

TRUE

Answer to Question 2

A

[j.rubin]

Thanks

[emilymalinowski12]

Welcome