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
The collection of eight planets and their moons in orbit around the sun.
Planet
A celestial body moving in an elliptical orbit around a star.
Moon
A natural satellite orbiting a planet.