In 2017, scientists pointed cosmic rays at the Great Pyramid of Giza. They found something that shouldn't exist. A void. 100 feet long, roughly the size of a passenger plane. Sitting directly above the Grand Gallery, one of the most explored passages in the pyramid. But this chamber has no doors. No tunnels. No way in. The Egyptians built it 4,500 years ago. Then they sealed it. And they never told anyone what was inside. We've explored this pyramid for centuries. Archaeologists, treasure hunter

If you think interstellar space is quiet and dark, think again. It's teeming with planetary objects and activity. Some things even passing through our neighborhood. Let's find out all the things that are traveling through interstellar space in an all-new HOW THE UNIVERSE WORKS at 10p EST! | Science Channel

Cosmic rays are tiny bits of atoms racing by us — and even sailing right through our bodies — all the time. Physicists can’t figure out where they came from, but they have some wild hypotheses: | Vox