What is the difference between: a star, moon, planet, galaxy, universe, and a satellite?

A star is a sun that uses nuclear fusion to create energy.

A moon is a body in orbit around another body. Normally, a moon orbits a planet, but it can also orbit other moons until it is dragged away by a larger body.

Though there are rogue planets that have been ejected from a solar system by other planets, a planet is a large body that orbits a sun after clearing its orbit of other objects.

A galaxy is defined as a large group of stars revolving around a central core; most, if not all, galactic cores are believed to contain a supermassive black hole.

All of the known galaxies and other objects make up the universe.

An object in orbit around another body is called a satellite. The Moon can also be thought of as a satellite, as can many man-made satellites orbiting the Earth.

Star: A luminous celestial body composed mostly of hydrogen and helium undergoing nuclear fusion.

Moon: A natural satellite that orbits a planet.

Planet: A celestial body that orbits a star, has sufficient mass for a nearly round shape, and has cleared its orbit of other debris.

Galaxy: A vast system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.

Universe: The entirety of space-time, including all matter, energy, planets, stars, galaxies, and cosmic structures.

Satellite: An object that orbits a planet, moon, or star, including natural satellites (moons) and artificial satellites created by humans.