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SpaceKids on SPACE.com
Over the years, we’ve gotten a lot of questions about planets, comets, asteroids, stars, galaxies, black holes and more, often from kids and sometimes from kids-at-heart. Inside SpaceKids on SPACE.com, you’ll find some great big questions and very simple, straightforward answers about everything from the moon to Mars and beyond into our Milky Galaxy and the universe itself.
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The planet Mercury looks a little bit like Earth's moon.
Mercury is the closest planet to the sun.
A lot of kids are led to believe this idea.
The first footprints put on the moon will probably be there a long, long time.
The moon, or any object, can be measured by diameter or mass.
Sunspots are darker, cooler areas on the surface of the sun.
The core of the sun is so hot and there is so much pressure, nuclear fusion takes place.
In theory, we could visit the sun. But the trip is long — about 93 million miles one way.
Yes, the sun will eventually burn out. But not for a long, long time.
Stars make their own light, but not planets.
Our sun is a star and all stars produce light.
The distance from Earth to Mars varies a lot, because Earth's orbit around the sun is might smaller than Mars' orbit.
Though pictures of the sun sure look fiery, the sun isn't on fire the way you might think.
The orbit of the moon around the Earth is not a perfect circle so the distance varies a little.
Temperatures on the moon vary wildly between the lunar day and night.
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