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Popular pages
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Solar System Exploration - NASA Science
The solar system has one star, eight planets, five dwarf planets, at least 290 moons, more than 1.3 million asteroids, and about 3,900 comets.
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Planets - NASA Science
Our solar system has eight planets, and five dwarf planets - all located in an outer spiral arm of the Milky Way galaxy called the Orion Arm.
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Home – NASA Solar System Exploration
NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.
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Overview | Our Solar System – NASA Solar System Exploration
An overview of our solar system in the Orion arm of the Milky Way galaxy.
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Overview | Planets – NASA Solar System Exploration
There are more planets than stars in our galaxy. We've discovered thousands of planets orbiting distant stars, but it all started with the worlds orbiting our star — the Sun. he current lineup include...
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Overview | Planets – NASA Solar System Exploration
What is a Dwarf Planet? The key difference between a planet and a dwarf planet is the kinds of objects that share its orbit around the Sun. Pluto, for example, has not cleared its orbit of similar obj...