is a ball of hot gasses that gives off light and other types of energy
A star
is everything that exists throughout space.
The universe
is a star system that contains large
groups of stars.
A galaxy
is a large nearly round space object that orbits a star.
A planet
is a large rocky object that orbits a planet.
A moon
is an object that orbits the sun, is larger than an asteroid and smaller than a planet, and has a nearly round shape.
A dwarf planet