What causes the Northern Lights — also known as the Aurora Borealis? In this video, we’ll explain the real science behind one of Earth’s most breathtaking natural wonders.

A mysterious new visitor has entered our solar system — 3I Atlas, only the third confirmed interstellar object ever observed. As it re-emerges from behind the Sun, astronomers are preparing to study its brightness, trajectory, and composition to uncover what it really is.

Telescopes don’t let us travel through time — but they do let us see ancient light from the distant past. In this video, I explain what astronomers really mean when they say “we’re looking back in time,” and how every observation reveals the universe’s history.