The astronauts returned to Earth.

Meaning: This sentence describes the action of people who travel into space going back to the planet that we live on.

Choice of Words: Astronauts are people who travel into space. Returned means to go back to a place. To means to move towards something. Earth is the planet that we live on. When you put them together, "The astronauts returned to Earth" tells us that the people who travel into space went back to the planet that we live on.

Alternative Expressions

Related Expressions