When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. General relativity has withstood perhaps its toughest challenge to date. The theory, which Albert ...

For over 100 years, two theories have shaped our understanding of the universe: quantum mechanics and Einstein’s general relativity. One explains the tiny world of particles; the other describes ...

(Reuters) -California-based startup Relativity Space called off the planned debut launch of its 3D-printed rocket in Florida on Wednesday over fuel temperature concerns, delaying a key test of the ...

Relativity Space, the first company to 3D print rockets and build the largest metal 3D printers in the world, today detailed its plans to operate one of the largest rocket engine test facilities in ...