A fast, dense pulsar with a white dwarf companion offered a unique test.
Albert Einstein's theory of special relativity explains how space and time are linked, but it doesn't include acceleration. By including acceleration, Einstein later developed the theory of general relativity, which explains how massive objects in the cosmos distort the fabric of space-time. The theory explains how this distortion is felt as the force of gravity, as it predicts how much the mass of an object curves space-time. Scientists test relativity by observing objects in space and seeing if their behaviors match up with Einstein's explanations of space-time and gravity, for instance by observing how light bends around massive objects as it travels towards Earth.
NASA's Kepler spacecraft has spotted an ultradense dead star bending the light of its larger companion.
Special relativity can accommodate objects moving faster than light, given a few minor adjustments, physicists say.
Our universe was born 13.7 billion years ago in a massive expansion that blew space up like a giant balloon.
The puzzling prevalence of matter over antimatter in the universe might be related to space-time warping.
The end state of a black hole may be a mind-bending kind of spacetime independent of time, scientists say.
Scientists have simulated the merger of a David black hole with a Goliath. Big surprise: Goliath wins.
Stephen Hawking talks about time travel, human space exploration, his family and various other topics in a wide-ranging interview with PARADE Magazine to be published this Sunday.
When galaxies collide, the merger between the supermassive black holes at their hearts could create super-powerful jets of radiation, a new study suggests.
Score one more for Einstein. A new study has confirmed his theory of general relativity works on extremely large scales.