Space and time seem like two completely different ideas, but Einstein's theory of relativity shows they are interlinked in a single fabric known as space-time.

Some things in cosmology may simply be unknowable. Why is there something rather than nothing? What lies outside the universe? What is inside a black hole? That last one has been niggling at ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The id ...

New observations of two black holes merging have confirmed predictions made decades ago by Albert Einstein, Stephen Hawking, and Roy Kerr. A decade ago, scientists first picked up ripples in the ...

Space-time is the map of where and when events happen. A worldline is the record of every event that occurs throughout one’s life. The key question is whether the map — or all the events it draws ...

A fresh black hole merger detection has offered the clearest evidence yet for Einstein’s relativity and Hawking’s predictions. Scientists tracked the complete cosmic collision, confirming that black ...

A fresh black hole merger detection has offered the clearest evidence yet for Einstein’s relativity and Hawking’s predictions. Scientists tracked the complete cosmic collision, confirming that black ...

For more than a century, physics has been built on two great theories. Einstein's general relativity explains gravity as the bending of space and time.

When two massive black holes slammed into each other earlier this year, astronomers were able to observe it in the clearest detail to date. Albert Einstein, the father of the theory of general ...

Ask someone to name the most important physicist of the 20 th century, and they will almost certainly say Albert Einstein. Ask the same question about the field of mathematics, however, and you will ...

Shubhanshu Shukla recalled being cautious about releasing objects in his initial days on the station. “I had this strange hesitation: if I let go of something, won’t it just fall? On Earth, that’s ...

A Hiroshima University team has designed a feasible way to detect the Unruh effect, where acceleration turns quantum vacuum fluctuations into observable particles. By using superconducting Josephson ...