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.

THE relativistic phenomenon of ‘time dilatation’ is usually taken as showing that, if R,M are two observers initially at rest on, say, the earth, and if M makes a journey and rejoins R who remains at ...

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 ...

Relativity Space said Monday that the company has successfully completed a full-duration test-firing of its Aeon 1 rocket engine, running it at full power for 187 seconds. The test at NASA’s Stennis ...

Relativity Space uses giant 3-D printers to produce components for its Terran rockets. (Relativity Space Photo) Relativity Space, the startup that was founded in Seattle and is now building 3D-printed ...

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

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 ...

Relativity Space is amping up its investment at NASA’s Stennis Space Center, with the company announcing today that it would lease a historic first-stage test stand to advance the development of the ...

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

Matthew Mewes is in the Department of Physics, College of Science and Mathematics, California Polytechnic State University, San Luis Obispo, California 93407, USA. The IceCube Collaboration instead ...

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 ...