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.

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Astronomy

Why is the night sky dark despite countless stars?

Quick fact

The universe is estimated to contain over 100 billion galaxies, each with billions of stars.

Why this is interesting

Have you ever looked up at a clear night sky and wondered why it's dark instead of glowing with starlight?