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space-time

Illustration of a clock in a spiral

Physics

Time loops may not be forbidden by physics after all

Physicists find that causal loops, where two events separated in time influence each other in paradoxical ways, are allowed in many theoretical universes, some of which share features with our own

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CAPSTONE

Space

Update – NASA's CAPSTONE spacecraft is on its way to the moon

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Contemplating the mysteries of the fourth dimension is time well spent

Physics

Contemplating the mysteries of the fourth dimension is time well spent

Leader

How do we make the most of our time? The power of confronting death

Life

How do we make the most of our time? The power of confronting death

Features

Why does time fly or drag? How emotions warp our temporal perceptions

Mind

Why does time fly or drag? How emotions warp our temporal perceptions

Features

5 Evolution - How long does evolution take? 2E8WW3F Time, traveling through space and time, 3d illustration

Earth

How long does evolution take? It happens on two different timescales

Features

8 Can we live without time?

Mind

Can we live without time? Not if we value a solid sense of self

Features

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?

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

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

Physicists have long sought to marry general relativity and quantum mechanics – now some reckon experiments that probe the way each theory treats time could finally make it happen

Features

Physics

What is time? The mysterious essence of the fourth dimension

Features

Physics

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

Features

Mind

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

Features

Earth

Emissions from rocket launches could affect Earth's weather systems

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