25.2

Question 1

How do stars come from nebula?

Answer 1

As the matter collapses, pressure from gravity causes the material at the center to heat up, creating a protostar

Question 2

What is a protostar? What conditions does it need to become a main sequence star?

Answer 2

A protostar is the beginning of a star.
Needs to:
-have the core reach 10M K
-balance of gravity & gas pressure

Question 3

What happens if a protostar can’t start hydrogen fusion?

Answer 3

It becomes a failed star and turns into a brown dwarf

Question 4

How are super giants formed? Why is this stage so shirt?

Answer 4

Stars form into red giants as hydrogen fuel slows, the balance between gas pressure and gravity is lost —> surface cools to red

Question 5

Explain white dwarf —> black dwarf

Answer 5

After small stars consume all their hydrogen fuel they collapse into a white dwarf.

Once the fuel is gone, it turns into a black dwarf