What evidence suggests that the Milky Way contains dark matter? ...

[Chelseaamend]

What evidence suggests that the Milky Way contains dark matter?
 
  A) We observe clouds of atomic hydrogen far from the galactic center orbiting the galaxy at unexpectedly high speeds, higher speeds than they would have if they felt only the gravitational attraction from objects that we can see.
  B) We see many lanes of dark material blocking out the light of stars behind them along the band of the Milky Way.
  C) We see many dark voids between the stars in the halo of the Milky Way.
  D) When we observe in different wavelengths, such as infrared or radio, we see objects that don't appear in visible-light observations.
  E) When we look at the galactic center, we are able to observe a large black hole that is composed of dark matter.

Question 2

Consider the following statement, and explain whether or not it is sensible: My sign is Ursa Major because the Sun was in Ursa Major when I was born.
 
  What will be an ideal response?

[Bigfoot1984]

Answer to Question 1

A

Answer to Question 2

Not sensible: The Sun appears only in the constellations of the zodiacand Ursa Major is not one of these.

[Chelseaamend]

Gracias!

[xiaomengxian]

Thanks for the timely response, appreciate it