The Synthesis of "planetary motion"

Discover Kepler's three laws of planetary motion, which describe how planets orbit the Sun. Learn why these fundamental principles of astronomy matter.

Discover Johannes Kepler, the 17th-century astronomer who revolutionized our understanding of the cosmos with his laws of planetary motion.

Discover Johannes Kepler, the 17th-century astronomer whose laws of planetary motion revolutionized our understanding of the solar system.

Discover orbital eccentricity, the key measure defining the shape of a planet's path from a perfect circle to an extreme ellipse. Learn why it matters.

Discover orbital mechanics, the science of how objects move through space. Learn how gravity and momentum dictate the paths of planets and spacecraft.

Discover our cosmic neighborhood! A simple guide to the Sun, the eight planets, and the celestial bodies that make up our amazing solar system.

What defines a planet? Explore the official definition, why Pluto was reclassified, and the exciting search for new worlds beyond our solar system.

Explore planetary science, the study of planets, moons, and solar systems. Learn why new missions and exoplanet discoveries make this field so vital.

Discover the radial velocity method, a key technique using the Doppler effect to find distant exoplanets by observing tiny stellar 'wobbles'.

Discover precession, the slow wobble of Earth's axis. Learn how this celestial motion shifts our pole star and affects long-term climate cycles.