Stories, updates, insights, and original analysis from The Planetary Society.

What are binary asteroids?

Binary asteroid systems can be found near Earth, in the main asteroid belt, beyond Neptune, and more.

What are asteroids made of?

C-type, S-type, and M-type are the three most common kinds of asteroids. Here's what each type is made of.

What DART has taught us so far

NASA's DART mission showed that if we detect a dangerous asteroid headed toward Earth, knocking it off course with a spacecraft is a potential option.

Is Planet X/Planet Nine real?

Planet X and Planet Nine are planets that have, at one time or another, been thought to exist in our Solar System. Both were hypothesized to explain the orbital characteristics of smaller outer Solar System bodies.

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