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cosmology

string theory

The Strange Second Life of String Theory

September 15, 2016

String theory has so far failed to live up to its promise as a way to unite gravity and quantum mechanics. At the same time, it has blossomed into one of the most useful sets of tools in science.

cosmology

A Debate Over the Physics of Time

July 19, 2016

According to our best theories of physics, the universe is a fixed block where time only appears to pass.

cosmology

Physicists Hunt for the Big Bang’s Triangles

April 19, 2016

The story of the universe’s birth — and evidence for string theory — could be found in triangles and myriad other shapes in the sky.

Q&A

From Einstein’s Theory to Gravity’s Chirp

February 18, 2016

The path from a revolutionary set of equations to the detection of gravitational waves was strewn with obstacles and controversy, explains the physicist Daniel Kennefick — and the struggle continues.

astrophysics

Gravitational Waves Discovered at Long Last

February 11, 2016

Ripples in space-time have been detected a century after Einstein predicted them, launching a new era in astronomy.

Physics

Visions of Future Physics

September 22, 2015

Nima Arkani-Hamed is championing a campaign to build the world’s largest particle collider, even as he pursues a new vision of the laws of nature.

Q&A

The Case for Complex Dark Matter

August 20, 2015

The physicist James Bullock explains how a complicated “dark sector” of interacting particles may illuminate some puzzling observations of the centers of galaxies.

Multimedia

Theories of Everything, Mapped

August 3, 2015

Explore the deepest mysteries at the frontier of fundamental physics, and the most promising ideas put forth to solve them.

cosmology

Why the Big Bang’s Light May Have a Tilt

June 30, 2015

Scientists haven’t tested the Big Bang’s light for a revealing shift in 25 years. A new experiment aims to change that.