By now you probably know that the solar system is filled with planets.
The planets, including the ones you see around you, are actually quite small objects, orbiting each other at just a little over 100 million miles (160 million kilometers).
What’s more, these planets don’t appear to have life on them.
As a result, astronomers call these planets neptunes.
While the solar systems neptunians are far away from our own, we still know enough about their properties to make predictions about their composition, size, and mass.
In this post, we’ll cover how to find out if these planets are neptubes.
The next article will cover the theory behind how to determine whether neptumes are planets.
This article originally appeared on The Planetary Society.