Astronomy & Space

Astronomy is one of humanity's oldest sciences, exploring the universe beyond Earth - its planets, stars, galaxies, black holes, and the cosmic events that shaped existence itself. Our solar system contains eight planets orbiting the Sun, along with moons, asteroids, and comets. Beyond lies the Milky Way galaxy, containing hundreds of billions of stars, itself one of an estimated two trillion galaxies in the observable universe. Space exploration - from Sputnik and Apollo to the Mars rovers and the James Webb Space Telescope - has expanded our knowledge enormously. This sub-category tests knowledge of celestial bodies, astronomical phenomena, space missions, and the scientific theories that explain the origin, structure, and ultimate fate of the universe.

This topic is part of Science - use the lab and fields tools below, then practice with flashcards and quizzes.