Composition of the Solar System, SpaceNext50
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The solar system consists of the Sun and those bodies orbiting around it: 8 (formerly 9) planets with about 170 known planetary satellites (moons).
Solar System National Air and Space Museum
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Astronaut, SpaceNext50
Voyager 1 - Wikipedia
Solar System: Facts - NASA Science
Solar System: Facts - NASA Science
Composition of the Solar System, SpaceNext50
SpaceNext50 Encyclopedia Britannica
International Space Station, SpaceNext50
Composition of the Solar System, SpaceNext50
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Six exoplanets spotted in a cosmic waltz around nearby star
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Outer Space Treaty, SpaceNext50
