We are searching for extraterrestrial life.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

Earth science is an important field of study for unraveling the mysteries of nature.

He was reading a book about the ancient Egyptian sun god.

A solar day is the time it takes for the Earth to orbit around the Sun.

The ocean currents can change due to the effect of the solar tide.

Global warming is a big issue that affects all of us.

He is an expert in geophysics.

He was hit hard in the solar plexus during the boxing match.

The heliocentric theory is the idea that the sun, not the earth, is the center of the universe.