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

Exoplanets

Quick fact

The first confirmed exoplanets were discovered in 1992 around a pulsar, not a Sun-like star. The first exoplanet orbiting a Sun-like star, 51 Pegasi b, was found in 1995 and is a 'hot Jupiter' that orbits its star every 4 days.

Why this is interesting

Did you know that most stars in the night sky likely host planets? Yet until 1992, we didn't know of a single one beyond our own Sun. What worlds might be hiding around our nearest neighbours?