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.

Scientists say fragments of energy may be the fundamental building blocks of the universe—not particles and waves.

Physics The radical idea that space-time remembers could upend cosmology There are new hints that the fabric of space-time may be made of "memory cells" that record the whole history of the universe.