Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric ...

What is space-time? Depending on how fast you're moving or how close you are do Earth's gravity can change the way time feels.

An ambitious new fleet of spacecraft could reveal whether space-time is smooth or chunky, and in doing so the ultimate nature of reality.

Ever since Einstein showed that gravity is the result of the curvature of space and time by a massive object, scientists have freely talked about space/time as some sort of fabric. But the very ...

People have always taken space for granted. It is just emptiness, after all—a backdrop to everything else. Time, likewise, simply ticks on incessantly. But if physicists have learned anything ...

Space to Think If the string theorists are correct, then space is built from quantum entanglement, and time might be as well. But what would that really mean? How can space be “made of ...

Once space and time themselves are flexible rather than fixed, what else is left that we can say is truly constant? There is one obvious candidate, again from Einstein himself: the speed of light.

An ambitious new fleet of spacecraft could reveal whether space-time is smooth or chunky, and in doing so the ultimate nature of reality.

Time always passed at the same rate, and was absolute as well. To any observer, particle, wave or quantum anywhere, they should experience space and time exactly the same as one another.

What is space-time? Depending on how fast you're moving or how close you are to Earth's gravity can change the way time feels.