Comets, Kuiper Belt, Ganymede, Callisto, Ganymede, Oort Cloud, Kuiper Belt, Oort Cloud, Gan
A comet is a small icy celestial body that orbits around the sun. It has a nucleus (solid, frozen ice), a gaseous coma (water vapor, CO2 and other gases) and a long tail. The International Astronomical Union (IAU) defines a planet as a Sun-orbiting astronomical body that has undergone the rounding process to achieve hydrostatic […]