When we say that a cluster of galaxies is acting as a ...

[ss2343]

When we say that a cluster of galaxies is acting as a gravitational lens, what do we mean?
 
  A) It magnifies the effects of gravity that we see in the cluster.
  B) It is an unusually large cluster that has a lot of gravity.
  C) It bends or distorts the light coming from galaxies located behind it.
  D) The overall shape of the cluster is that of a lens.

Question 2

What kind of object do we think lies in the center of the Milky Way Galaxy?
 
  A) a 3- to 4-million-solar-mass black hole
  B) a gigantic X-ray binary system
  C) a dense cluster of young, hot stars
  D) an enormous collection of dark matter, which explains why we detect no light at all from the galactic center

[elizabethrperez]

Answer to Question 1

C

Answer to Question 2

A

[ss2343]

Excellent

[ebonylittles]

Wow, this really help