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time

Space

Is the universe really one big black hole?

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density – given that the universe contains a lot of relatively empty space, could the whole cosmos be a 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

Physics

Ultracold clocks could reveal how quantum physics alters time

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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

Almost a decade ago, researchers calculated that microwaves can seemingly spend an imaginary amount of time within a material – now an experiment reveals how the phenomenon is perfectly real

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Physics

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

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

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