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Gravity is a natural phenomenon by which all things with mass or energy are brought toward one another. In astronomy, gravity is the force that holds together stars, planets, galaxies, and structures in the cosmos, and influences the trajectory of celestial objects.

The weak nuclear force is responsible for the process known as beta decay, which changes one type of subatomic particle into another. In astronomy, it plays a key role in stellar processes like the fusion reactions that power stars and the supernovae explosions that spread elements throughout the universe.

Electromagnetism is a fundamental force that acts between charged particles and is carried by photons. It's crucial in astronomy for the formation of planetary systems, the behavior of stars, and the emission of light and other forms of electromagnetic radiation in space.