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3D6BBB4 Comet Lemmon photographed from northern Italy on 26th October 2025.

Space

Comets were on fire this year – for better or worse

Field Notes From Space-Time columnist Chanda Prescod-Weinstein on how comets grabbed the headlines in 2025

Comment

Are we living in a simulation? This experiment could tell us

Physics

Are we living in a simulation? This experiment could tell us

Features

Space

A distant galaxy is being strangled by the cosmic web

News

Space

Is the expansion of the universe slowing down?

News

CMB-S4 will use telescopes installed at the South Pole to measure variations in the temperature and polarization of microwave light across most of the sky to probe for ripples in space-time. Shown here is the South Pole Telescope. Photo: Brad Benson, University of Chicago, Fermilab

Space

The end of US support for the CMB-S4 telescope is devastating

Comment

The 30-year fight over how many numbers we need to describe reality

Physics

The 30-year fight over how many numbers we need to describe reality

Features

Space

Is the universe really one big black hole?

Comment

Do black holes exist and, if not, what have we really been looking at?

Space

Do black holes exist and, if not, what have we really been looking at?

Features

Space

We’ve discovered the most massive black hole yet

News

Chaotic streams of energy appear to slice through space

Physics

Is gravity a new type of force that arises from cosmic entropy?

Decades ago, a renegade physicist suggested that gravity isn't so much a force as just a byproduct of the universe's tendency to get more disordered. Now this idea might finally be testable

Features

Physics

Laws of quantum physics may rule out a universe that came before ours

News

Mathematics

Why physicists think geometry is the path to a theory of everything

Features

Space

Why are the physical constants of the universe so perfect for life?

Features

Space

The Milky Way's black hole may be spinning at top speed

News