What force tends to collapse the Sun toward its center?

Question 28 options:

1)	Strong nuclear force

2)	Electromagnetism

3)

Gravity

4)

Pressure

5)	Temperature

6)	Solar force

Question 29 (1 point)

Why does nuclear fusion in the core of a star require very high temperatures?

Question 29 options:

1)	To overcome electromagnetic forces.

2)	To overcome very high gas pressures.

3)	To balance out powerful gravitational forces.

4)	To balance out powerful tidal forces.

5)	To ensure that a hydrostatic equilibrium is maintained.

Question 30 (1 point)

Which layer of the Sun is considered to be its visible surface?

Question 30 options:

1)

Core

2)	Photosphere

3)

Corona

4)	Chromosphere

5)	Convective zone

6)	Radiation zone