Blog

Learn why planets become round, how gravity and pressure shape them, and why some small worlds still break the rule.

Explore how Earth fits in the solar system, from its orbit and composition to its habitability, neighbors, and place in the Milky Way.

Learn how dwarf planets and moons differ in orbit, formation, classification, and examples across the Solar System.

Learn how ice giant planets form, why Uranus and Neptune are different from gas giants, and what astronomers still need to explain.

A clear guide to the methods astronomers use to infer planetary composition from afar, including spectra, density, and planetary formation clues.

Discover why Saturn’s rings stand out so clearly, from their icy composition to their viewing geometry and surprising thinness.

Learn why Saturn’s rings remain in orbit, what keeps the particles from collapsing, and how gravity, orbital speed, and moons shape the ring system.

Discover why planets spin, how rotation begins, and what shapes each world’s day, climate, and history.

Learn what the solar system is, how it formed, and what objects belong to it—from the Sun and planets to dwarf planets, moons, and distant small bodies.

Learn simple, reliable ways beginners can observe the solar system with just your eyes, binoculars, or a small telescope.