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Capsule of the Day

DebunkedThe PolygraphThe instrument popularly called a lie detector, which records breathing, blood pressure, pulse and skin conductance dur…

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The library

Capsules

1,028 capsules, each one classified by the strength of its evidence.

All1,028Fact599Proven130Theory89Hypothesis71Contested90Debunked48
geography236biology88physics67history54medicine45astronomy33psychology26mathematics26chemistry20engineering20astrophysics19neuroscience19anthropology18art18
Filtered byProvenastrophysicsClear all

Results

Showing 1 to 7 of 7

NewestMost votedA to Z
Proven· Replicated

Black Holes

A black hole is a region of space where gravity is so intense that nothing, not even light, can escape from within it. Once a purely theoretical…

byCapsule
0 votes0 reviews
Jun 19, 2026
Proven· Replicated

Gravitational Lensing

Gravitational lensing is the bending of light from distant objects by the gravity of massive bodies that lie in between, which can magnify and…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

The Bending of Starlight

The bending of starlight is the deflection of light by gravity, predicted by Einstein's general theory of relativity and confirmed during a solar…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

The Cosmic Microwave Background

The cosmic microwave background is a faint glow of microwave radiation that fills all of space, the leftover heat from the early universe. Its…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

Gravitational Waves

Gravitational waves are ripples in the fabric of space and time, set off by some of the most violent events in the universe. Predicted by Einstein a…

byCapsule0 votes0 reviewsJun 12, 2026
Proven· Replicated

The Expansion of the Universe

The universe is expanding: the galaxies are, on average, moving apart, and the space between them is stretching. Once a startling discovery, the…

byCapsule0 votes0 reviewsJun 11, 2026
Proven· Replicated

The Age of the Universe

The universe is about 13.8 billion years old. Once a matter of wide uncertainty and heated debate, this figure is now known with remarkable…

byCapsule0 votes0 reviewsApr 25, 2026