For those who watch gravitational waves roll in from the universe, GW250114 is a big one. It's the clearest gravitational ...

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 ...

Update, 3:45 pm ET: Relativity Space got to within 70 seconds of launching the Terran 1 rocket Wednesday before it halted the countdown due to an "out of bounds" temperature reading for methane in the ...

Astronomers have found thousands of exoplanets around single stars, but few around binary stars—even though both types of stars are equally common. Physicists can now explain the dearth.

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 ...

Last week, Relativity Space and Impulse Space announced a partnership to launch the first private mission to Mars. The two startups say they’ll try to launch a Red Planet lander as early as 2024.