What is the difference between a planet and a star?

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

• What is the difference? I need help because this is for my homework! Thanks :3

• Answer:

  A star is a self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy generated by nuclear reactions in the interior is balanced by the outflow of energy to the surface, and the inward-directed gravitational forces are balanced by the outward-directed gas and radiation pressures. A moon is a natural satellite revolving around a planet. A planet is a nonluminous celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves. A galaxy is any of numerous large-scale aggregates of stars, gas, and dust that constitute the universe, containing an average of 100 billion solar masses and ranging in diameter from 1,500 to 300,000 light-years. Also called nebula. A universe is all matter and energy, including the earth, the galaxies, and the contents of intergalactic space, regarded as a whole. A satellite can be defined as any object, either manmade or naturally occurring, that orbits around something else. For example, the moon orbits around Earth and is thus a satellite. The Earth orbits around the sun and is a satellite of the sun. Other examples of naturally occurring satellites include comets, stars, asteroids, and other planets.