Fidelity's Contrafund marked down its biggest stake in Space X-rival Relativity Space by around 21%, from $22.83 a share to $17.96.

Thanks to Einstein’s relativity, time flows differently on Mars than on Earth. NIST scientists have now nailed down the ...

In the hunt for extraterrestrial life, we usually look for planets orbiting sun-like stars and icy moons. But there is another possible candidate—planets circling white dwarfs, the hot, dense remnants ...

In 2015, the general theory of relativity will be 100 years old. In November 2015, Albert Einstein gave weekly lectures to the Prussian Academy of Sciences in which he set out the fundamental field ...

GPS accuracy relies on Einstein's relativity theories to correct satellite timing errors that would otherwise cause 6+ mile ...

California-based startup Relativity Space is one of many launch startups, but it stands out for its 3D-printing approach to manufacturing rockets while also pursuing fully reusable rockets. Relativity ...

See how Relativity's Terran 1 rocket got from the 3D printer to the launch pad in these highlights. Credit: Relativity Space ...

Light from a distant γ-ray burst backs up a key prediction of Albert Einstein's theory of relativity — that photon speed is the same regardless of energy. But it might set the stage for evolution of ...

Monisha Ravisetti was a science writer at CNET. She covered climate change, space rockets, mathematical puzzles, dinosaur bones, black holes, supernovas, and sometimes, the drama of philosophical ...

Why can't anything travel faster than the speed of light? Do black holes really suck? And why is the universe expanding? These are just a few of the questions author and astrophysicist Jeffrey Bennett ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. When we think about Einstein and the theory of relativity, all sorts of ...