Is there intelligent life on other planets?

The planets revolve around the sun.

Planets move around a fixed star.

The surface of a planet is composed mostly of water.

The smaller planets hovering around the planet Jupiter reminded him of the guards surrounding a king when he walked outdoors, and Kepler called them satellites.

Seen through a telescope, the planets take on a completely new appearance.

They sent some people to live on the planet.

Animals and plants live on this planet.

Astronomy deals with the stars and planets.

J. Kepler, astronomer and mathematician, made a study of planets and their movements.

Nine planets including the earth are moving around the sun.

The Earth, Mars and Jupiter are planets.

The earth is one of the planets.

The earth is a beautiful planet.

The earth is one of the sun's planets.

The earth is different from the other planets in that it has water.

The Earth is a small but beautiful planet.

The earth is not a star, but a planet.

The earth is not a star, but a planet.

There are nine planets travelling around the sun, the earth being one of them.