A galaxy is: a. a thin cloud from which a sun and planets can ...

[Redwolflake15]

A galaxy is:
 a. a thin cloud from which a sun and planets can form.
 b. a large diffuse cloud of gas.
 c. what forms in the center of a cloudlike sphere of gases that flattens and condenses.
 d. a huge rotating aggregation of stars, gas, and other debris held together by gravity.

Question 2

Extrasolar planets, those planets that are outside our solar system:
 a. have not yet been discovered.
 b. are being discovered regularly.
 c. are certainly not at all like Earth.
 d. do not exist.

[fwbard]

Answer to Question 1

d

Answer to Question 2

b