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Understanding planets, moons, and satellites

Space physics • Solar system and orbits

Key concepts

What you'll likely be quizzed about

  • Orbital motion refers to the gravitationally-bound movement of one body around another.
  • It usually involves the rotation of planets around stars, moons around planets, and artificial satellites around Earth.
  • The shape and speed of an orbit depend primarily on the bodies' masses and the distance between them.

Flashcards

Test your knowledge with interactive flashcards

What keeps the Moon in orbit around Earth?

Click to reveal answer

Earth's gravitational pull acts as the centripetal force keeping the Moon in orbit.

Key notes

Important points to keep in mind

Orbital motion is governed by gravitational forces.

Circular orbits have constant distances from their central body.

Gravity is the key to maintaining planetary orbits.

Elliptical orbits can vary in distance during rotation.

Newton's law describes the attraction between masses.

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