What is the solar system's coldest spot and how does the coldest place on Earth compare? When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works .

Most of the planets in our solar system have nothing on the exoplanet nicknamed “Hoth.” Located 20,000 light years from Earth, the planet known as OGLE-2005-BLG-390Lb was discovered in 2006.

For a few evenings around 28 February, every planet in the solar system will be visible in the night sky, thanks to a rare great planetary alignment. Here's how to make sure you don't miss this ...

Many smaller outer solar system objects appear to have orbits that are aligned in certain mysterious ways; the simplest explanation is that their motions are influenced by another, as-yet-unseen ...