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cosmology

telescope 1

Technology

How to dust a telescope’s 78-square-metre mirror with CO2

The Hobby-Eberly telescope in western Texas will soon look back 8 billion years to probe what dark energy is. It must be perfectly buffed for the task

Regulars

brain artwork

Health

To advance science we need to think about the impossible

Leader

light

Physics

Cosmic uncertainty: Is the speed of light really constant?

Features

Boltzmann brains

Physics

Universes that spawn 'cosmic brains' should go on the scrapheap

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Globular cluster 47 Tucanae

Space

Rare mid-weight black hole found at heart of bright star cluster

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Hologram

Space

Have we found evidence that we live in a holographic universe?

Comment

A meteorite from the Sahara

Earth

Earth’s water must have arrived here earlier than we thought

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galaxies

Space

First evidence of dwarf galaxy merger boosts two cosmic theories

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Artists rendition of a binary star with a disc of dust around it

Space

Binary stars shred up and shove off their newborn planets

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One spherical object being ejected by a larger one

Space

Milky Way's core could be spewing out planet-sized star chunks

The supermassive black hole at the galaxy's heart can stretch and shred stars that approach – then fling the shreds away as spheres as small as Neptune

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Space

Cosmic radio bursts tracked to home galaxy for first time

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Space

First test of rival to Einstein's gravity kills off dark matter

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Space

Galaxy's rapid growth spurt may have spawned 3000 suns per year

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Space

Dark matter that talks to itself could explain galaxy mystery

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