Planets in our Solar System

The Solar System consists of the Sun and its planetary system of eight planets, their moons, and other objects including asteroids and meteors.

A new 9th planet for the solar system?

Observations of the orbits of six small objects have led researchers to propose a very large 9th planet--100s of astronomical units (AU) away from the sun.

Chris Cole
The discovery of new planets is one fascinating aspect of astronomy.
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