An asteroid is a small rocky, metallic, or carbon-rich body orbiting the Sun. Learn about types, formation, impacts, threats, and exploration.
Astronomy
Learn what solar wind is, how fast it travels, where it comes from, and how it affects Earth, space weather, and the Solar System.
Solar Wind – Definition, Speed, Types, and Effects
Learn what Lagrange points are, how L1 through L5 work, their stability, physics, spacecraft uses, and Trojan asteroids.
Lagrange Points – Definition, Types, and Uses
Learn what a brown dwarf is, how it forms, its properties and types, and how it differs from stars and planets.
Brown Dwarf – Definition, Characteristics, Formation, and Examples
Learn what a red giant is, how it forms, how it generates energy, and what happens when the Sun eventually becomes one.
Red Giant – Definition, Formation, Characteristics, and Examples
Learn what the Roche limit is, how to calculate it, and why tidal forces create rings, disrupt moons, and shape planetary systems.
Roche Limit – Definition, Formula, Physics, and Examples
Learn what light pollution is, its causes, types, effects on people and wildlife, and practical ways to reduce it.
Light Pollution: Definition, Causes, Effects, and Solutions
Explore Planet Nine, the proposed ninth planet beyond Neptune, including evidence, location, and ongoing searches.
Planet Nine – The Search for the Solar System’s Hidden ...
Learn about galaxies, including galaxy types, structure, formation, the Milky Way, dark matter, black holes, and cosmic evolution.