Question

Which of the four fundamental forces is responsible for astronomical phenomena?

Answer 1

All of them.

Explanation:

Gravity is in many ways the defining force as it acts over huge distances. It is responsible for the motions of solar systems and galaxies.

The electromagnetic force prevents stars from collapsing due to their gravity as it prevents atomic nuclei getting too close. The exception to this is when gravity overcomes it to create neutron stars and black homes.

The strong nuclear force is what makes stars shine. Huge amounts of energy are released when lighter atomic nuclei fuse into heavier nuclei.

The weak nuclear force is also required to make stars shine. Two protons can only fuse if one is first turned into a neutron. This requires the weak force.