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 Role of Neutrinos in Core-Collapse Supernovae

Quick fact

In 1987, neutrino detectors around the world recorded a 10-second burst of neutrinos from Supernova 1987A, confirming that neutrinos carry away nearly all of the system's gravitational energy. That same energy is what re-energizes the dying star's shockwave, allowing it to blow the outer layers into space.

Why this is interesting

An enormous star collapses in seconds, yet the explosion that follows is powered not by fire or shock waves but by the smallest particles in the cosmos. What enables this cosmic rebirth?