Question

what force caused stars to form from clouds of gas and dust?
a. magnetism
b. gravity
c. radiation
d. electricity
question 5 (1 point)
what are galaxies?
a. groups of planets orbiting a single star
b. vast collections of stars bound together by gravity
c. clouds of gas without stars
d. remnants of exploded stars only

Explanation:

For the first question, gravity pulls gas and dust in a nebula together to form stars. For the second question, galaxies are large - scale structures of stars held together by gravity.

Answer:

1. b. gravity
2. b. vast collections of stars bound together by gravity