Question

Which two events occur when gravity causes a nebula to collapse into itself?
A. Nuclear fusion starts.
B. The nebula cools down.
C. A supergiant forms.
D. A new star forms.

Answer 1

The two events that occur  when gravity causes a nebula to collapse into itself are:

A. Nuclear fusion start.

B. A new star forms.

Explanation:

• Nebula are giant clouds of dust and gases.
• These clouds are considered as progenitors of stars and planets.
• The gravitational pull within these giant clouds result these large masses to collapse towards their centre.
• The gravitational collapse results in tremendous rise in temperature till a point where nuclear fusion begin .
• The stars are born out of such mechanism and act as a source of heat and light in universe.

Answer 2

Answer:

Its a and d

Explanation:

I just did it on a p e x