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Theories of Everything, Mapped
Explore the deepest mysteries at the frontier of fundamental physics, and the most promising ideas put forth to solve them.
The Fuzzball Fix for a Black Hole Paradox
By replacing black holes with fuzzballs — dense, star-like objects from string theory — researchers think they can avoid some knotty paradoxes at the edge of physics.
Interactive: What Is Space?
Imagine the fabric of space-time peeled back layer by layer.
How Quantum Pairs Stitch Space-Time
New tools may reveal how quantum information builds the structure of space.
Wormholes Untangle a Black Hole Paradox
A bold new idea aims to link two famously discordant descriptions of nature. In doing so, it may also reveal how space-time owes its existence to the spooky connections of quantum information.
In Fake Universes, Evidence for String Theory
If string theorists can show that their framework is the only consistent theory of quantum gravity, does that make it true even without tangible evidence?
Possible Echo of Big Bang Detected
Scientists report the possible discovery of primordial gravitational waves, ripples in space-time that carry a record of how the universe began.
Betting on the Future of Quantum Gravity
New calculations suggest physicists may someday discover a fundamental theory of gravity, but it could require a radical new perspective on the universe.
Physicists Eye Quantum-Gravity Interface
Physicists have devised experiments that can probe the interface between quantum mechanics and general relativity.