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

The Habitability of Planets Orbiting Red Dwarf Stars

Quick fact

Red dwarf stars are only about one-tenth to one-half the mass of our Sun, yet they host more Earth-sized planets in their habitable zones than any other stellar type.

Why this is interesting

The most common stars in the universe are small, dim, and red. Could their planets be the best places to find alien life—or the worst?