Question 1:

Which of the following is a large cloud of gas and dust in space where stars are born?

Explanation: A nebula is a large cloud of gas and dust in space where stars are born.

Question 2:

What is a group of stars that are physically close and gravitationally bound together?

Explanation: A star cluster is a group of stars that are physically close and gravitationally bound together.

Question 3:

Which type of star cluster contains thousands or even millions of stars that formed together from the same giant molecular cloud?

Explanation: A globular cluster contains thousands or even millions of stars that formed together from the same giant molecular cloud.

Question 4:

What type of nebula is created when a massive star explodes in a supernova?

Explanation: When a massive star explodes in a supernova, it creates a supernova remnant nebula.

Question 5:

What type of nebula is illuminated by the ultraviolet radiation of nearby hot stars?

Explanation: An emission nebula is illuminated by the ultraviolet radiation of nearby hot stars, causing the gas to emit light of various colors.