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How Many Planets Are in the Solar System? | Astronomy.com

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How Many Planets Are in the Solar System?

How Many Planets Are in the Solar System?

The most important question has to be: What makes a planet, anyway?

Published: Monday, September 01, 2014

PLANET MAKER. In this artwork showing the early solar system, an enormous dust disk stretches around the Sun and serves as a breeding ground for new planets as material clumps together.

NASA/JPL-Caltech

You might think astronomers know the solar system, the region of space immediately closest to home, pretty well. And they do. But they might not know its whole story.

Astronomy subscribers can read the full article for free. Just make sure you're registered with the website.