Astronomy
Learn about the vast expanse of space with these pages.
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Neptune is the eighth planet from the sun in our solar system.
Comets. A comet is a small, icy celestial body that orbits around the sun. It is made up of a nucleus (solid, frozen ice...
Pluto is a dwarf planet that usually orbits past the orbit of Neptune. It was classified as a dwarf planet in 2006; before...
A list of famous astronomers throughout history.
Jupiter is the fifth and largest planet in our solar system. This gas giant has 39 known moons and a dark, barely-visible ring.
Learn about the life cycle of a star with this helpful diagram.
Astronomy in the Classroom has K-12 curriculum ideas and class projects.
Astronomy glossary explains basic astronomical terms, T.
Stars are classified by their spectra (the elements that they absorb) and their temperature.
A galaxy is a huge group of stars, dust, gas, and other celestial bodies bound together by gravitational forces. Learn more...
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