The International System of Units is a standard of measurement widely used around the world.

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.

He believes in the geocentric theory.

A terrestrial planet may have an environment similar to Earth.

Greenwich Mean Time is the standard that determines the time of the world.

The Dow Jones Industrial Average has dropped significantly.

We are implementing a social distancing strategy to prevent the spread of the new coronavirus.