Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Astronomy

How Cosmic Rays from Supernovae Affect Earth's Atmosphere

Quick fact

Cosmic rays from supernovae can create charged particles in the atmosphere that act as seeds for cloud droplets, potentially increasing cloud cover and cooling the planet.

Why this is interesting

Every second, thousands of particles from exploded stars far across the galaxy are zipping through your body and into Earth's atmosphere — but could these cosmic bullets actually be changing our weather?