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JILA?s three-dimensional (3-D) quantum gas atomic clock consists of a grid of light formed by three pairs of laser beams. A stack of two tables is used to configure optical components around a vacuum chamber. Shown here is the upper table, where lenses and other optics are mounted. A blue laser beam excites a cube-shaped cloud of strontium atoms located behind the round window in the middle of the table. Strontium atoms fluorescence strongly when excited with blue light.

Physics

Jun Ye interview: What use is the world's most accurate clock?

The most advanced atomic clocks don’t just tell time – they could soon get so ludicrously accurate that they could be used for detecting gravitational waves and testing the limits of relativity

Features

6 Will we ever unite physics? The infinite time is circulating in the universe, 3D illustration; Shutterstock ID 498879817; purchase_order: -; job: -; client: -; other: -

Physics

Will we ever unite physics? Clocks in superposition could offer clues

Features

Will time ever end? The answer lies in the death throes of the cosmos

Physics

Will time ever end? The answer lies in the death throes of the cosmos

Features

3 How Do We Sense Time? Mechanical brain, conceptual image. Composite image of coloured medical imagery of a human brain and skull, with cogs and gears representing concepts such as memory, time and mechanical brains. The imagery includes 3D computed tomography (CT) scans of the skull and 3D magnetic resonance imaging (MRI) scans of the brain. The scans are of a 30-year-old woman.

Mind

How do we sense time? The brain cells that order our memories

Features

What is time? The mysterious essence of the fourth dimension

Physics

What is time? The mysterious essence of the fourth dimension

Features

Could we ever go back in time? Relativity does not rule it out

Physics

Could we ever go back in time? Relativity does not rule it out

Features

Mandatory Credit: Photo by SpaceX/ZUMA Wire/Shutterstock (10664346i) A SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft is launched on NASA's SpaceX Demo-2 mission to the International Space Station with NASA astronauts Robert Behnken and Douglas Hurley onboard. NASA's SpaceX Demo-2 mission is the first launch with astronauts of the SpaceX Crew Dragon spacecraft and Falcon 9 rocket to the International Space Station as part of the agency's Commercial Crew Program. SpaceX Demo-2 Historic Manned Launch, Cape Canaveral, Florida, U.S. - 30 May 2020

Earth

Emissions from rocket launches could affect Earth's weather systems

News

Sentinel-3, one of the satellites used by the Copernicus programme

Space

UK may go it alone in orbit after Brexit shutout from EU space plans

News

Gaia

Space

Gaia telescope’s new map of the Milky Way will let us rewind time

News

A stock image of crystals

Physics

A new kind of time crystal has been created and lasts 10 milliseconds

A time crystal has been created by firing lasers at rubidium atoms. It only lasts for 10 milliseconds, but it could reveal the precise scale at which quantum effects take hold

News

Space

James Webb Space Telescope was hit by a tiny space rock – but it’s OK

News

Space

How lessons learned from space exploration could feed the world

Comment

Space

The rise of SpinLaunch, the company planning to hurl things into space

News

Space

Betelgeuse star dimming puzzle solved by chance with weather satellite

News