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Articles on Uranus

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Saturn is one of a few planets in our solar system surrounded by rings. Vadim Sadovski/Shutterstock/Elements of this image furnished by NASA

Curious Kids: why are some planets surrounded by rings?

We’re not sure how the rings work or how they formed, but there are a few theories.
In 2015, NASA’s New Horizons spacecraft looked back toward the sun and captured this near-sunset view of the rugged, icy mountains and flat ice plains extending to Pluto’s horizon. NASA/JHUAPL/SwRI

Planetary confusion – why astronomers keep changing what it means to be a planet

Many people are still upset that Pluto was demoted from being a planet. But definitions of various celestial objects are fairly fluid. So whether it is an asteroid or moon or planet is up for debate.

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