The UniverseAnswer
Why is the speed of light the universe’s speed limit?
The limit belongs to the structure of space and time; light in a vacuum travels at that limit because it has no rest mass.
TOPIC
Particle physics.
Stories and answers about #Particle physics
FROM THE QUESTION LIBRARY
Short answers, with sources.
The UniverseAnswer
Why is there any matter left in the universe at all?
The matter in every star and body may be the remnant of a tiny early imbalance whose cause remains unknown.
The UniverseExplainer
What Is Dark Matter?
Galaxies spin too fast and light bends too much, so something unseen seems to be out there, but nobody yet knows what it is.
The UniverseExplainer
Can Anything Travel Faster Than Light?
Shadows, stretching space and a famous neutrino scare all seem to break the cosmic speed limit. Here is why the limit still stands.
The UniverseExplainer
Why Is There More Matter Than Antimatter?
The Big Bang should have left an almost empty universe. A tiny surplus of matter built everything we know, and nobody yet knows why.
The UniverseExplainer
Is There a Theory of Everything?
Physicists have merged forces of nature before. Gravity is the holdout, and no candidate theory of everything has yet passed a decisive test.
OriginsExplainer
How Could We Test an Extra Dimension?
An unseen direction in space is a serious possibility in some models. What would it change in a detector, and what would count as evidence?