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Physics

What's the (dark) matter?

We don’t know what it looks like, and can’t even be certain it exists. Welcome to the frustrating and fascinating world of dark matter.

Physicists explain: Gravitational Waves

Two scientists talk about how you compute the observational signatures from the birth of the Universe.

Gravity: it is all in your head

We take it for granted that gravity pulls things towards the Earth. But in reality this is just one of many explanations. And they are all equally made up.

Retiring the prototype kilogram

The kilogram is the last international measurement standard that relies on a precisely crafted physical object. This standard-bearer will soon be replaced by space-age measurements based on physical constants.

Scientists get to grips with a tricky liquid

They have studied exactly what happens when such a liquid solidifies and becomes glass.

Are soccer roars self-amplifying?

Does the volume double when two persons yell together? A reader has questions about the hoots and hollers of the crowd at his local football stadium.

Physicists want to recruit more young quantum physicists

A Danish physicist has constructed a quantum physics laboratory especially for high school students to attract more young people to the field.

Gravitational-wave astronomy will change our understanding of the universe

Nearly two years ago, LIGO opened up a new window onto the cosmos when they discovered gravitational waves. But what has happened since and how could it change our understanding of space, time, and gravity?

New theory explains how metals melt and freeze

Physicists have discovered how the melting process works at extreme pressures such as those found inside the Earth’s core.

Making astrophysical simulations more accurate

The model used to measure the mass of particles such as protons and neutrons has been used by physicists for almost 50 years. Now Tomas Brauner and his research collaborators discovered that two terms in the model’s equation were missing.