A big scientific encyclopedia "Astronomy, Cosmology, Astrophysics": universe, asteroids, exoplanet, deep space, dwarf planets, supernova, constellation.

Astronomy is a natural science that studies celestial objects and phenomena. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation.