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Lunar Eclipses and Solar Eclipses
What’s the difference?
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Learn about what makes our Sun a very busy place!
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The Sun’s activity follows an 11-year cycle. Learn more about it!
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Learn more about what happens when the moon passes between Earth and the sun!
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Where Does the Solar System End?
The Oort Cloud!
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How Many Solar Systems Are in Our Galaxy?
Astronomers have discovered 2,500 so far, but there are likely to be many more!
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How Did the Solar System Form?
The story starts about 4.6 billion years ago, with a cloud of stellar dust.
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Play Solar System Switch-a-Roo!
Put clues together to find the planets and moons.
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Gallery of NASA Solar System Images
Glorious planets and moons to view or print.
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Jumping the Tallest Cliff in the Solar System
How far would we have to travel to get there?
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Why is the sun's atmosphere so much hotter than its surface?
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This type of weather comes from activity on the Sun’s surface.
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