How do we know that there are intergalactic clouds between a ...

[asan beg]

How do we know that there are intergalactic clouds between a distant quasar and us?
 
  A) We see hydrogen emission lines at redshifts smaller than that of the quasar.
  B) We see hydrogen absorption lines at redshifts smaller than that of the quasar.
  C) We see hydrogen emission lines at redshifts greater than that of the quasar.
  D) We see hydrogen absorption lines at redshifts greater than that of the quasar.
  E) We see that the emission lines from the quasar are lessened by intervening gas and dust.

Question 2

According to Gwen back on Earth, about how long does it take Jackie to reach Vega?
 
  A) about a month
  B) about 10 years
  C) about 25 years
  D) about 100 years
  E) about 1,000 years

[AaaA]

Answer to Question 1

B

Answer to Question 2

C

[asan beg]

Both answers were spot on, thank you once again

[AaaA]

Great! Please up vote