Language/English/Vocabulary/Astronomy
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Universe
Everything that exists in space.
Galaxy
A system of millions of stars.
Star
A star is a type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The sun is the star closest to our planet.
Solar System
Any collection of planets and their moons orbiting around a star; "Our Solar System" consists of eight planets (earth included), some of them with one ore more moons, planetoids, asteroids, and our sun.
Planet
A celestial body moving in an elliptical orbit around a star.
Moon
A natural satellite orbiting a planet.