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time

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?

Black holes are so strange that physicists have long wondered if they are quite what they seem. Now we are set to find out if they are instead gravastars, fuzzballs or something else entirely

Features

Physics

Ultracold clocks could reveal how quantum physics alters time

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Geometric 3d render shower of decorative starry short lines. Digital waterfall made futuristic straight shapes with random repetition. Tears outer space falling in rays bright stars.; Shutterstock ID 1952851798; purchase_order: -; job: -; client: -; other: -

Physics

Should it be space-time or spacetime – and why does it matter anyway?

Comment

2H2KWEA Big Bang to Present. Stages in the history of the Universe after the Big Bang. At 300, 000 years, matter and radiation decouple, and the Universe becomes transparent for the first time. The first galaxies form at around 300 million years after the Big Bang, but the exact time period is uncertain. At an age of 9 billion years the Solar System formed. Finally, 13.7 billion years after the Big Bang we arrive at the present day. The Universe is still expanding and evolving.

Physics

What happens to light's energy when it redshifts? It's complicated

Comment

Mathematics

These centuries-old equations predict flowing fluid – until they don’t

Comment

Chaotic streams of energy appear to slice through space

Physics

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

Features

Physics

Where does time actually come from?

Comment

Astronaut Scott Kelly posted this photo of an aurora taken from the International Space Station to Twitter on August 15, 2015

Physics

The radical idea that space-time remembers could upend cosmology

Features

Physics

Microwaves seem to experience imaginary time – and now we know how

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2M7PPCR HMS EREBUS trapped in the ice in 1846 during the third Franklin expedition to find a Northwest Passage .Painting byFrancois Musin about 1850

Physics

Fabulous time travel novel is part-thriller and part-romance

In Kaliane Bradley's The Ministry of Time, a young woman must help a naval commander snatched from death in 1847 adapt to the 21st century. Time travel thriller meets romance in this excellent novel

Culture

Space

Why it's taking a century to pin down the speed of the universe

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Physics

Read an extract from time-travel novel The Ministry of Time

Culture

Comment

'Time travel was just a metaphor for controlling a narrative'

Culture

Physics

How dark energy findings may inspire a new generation of physics nerds

Comment

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