Cosmology

After decades of planning, NASA’s Artemis program is giving astronomers their long-awaited moonshot

A single subatomic particle from deep space had the same energy as a baseball pitch, and scientists still don’t know how it got here

Decades of data have suggested the universe is flat, much like an infinite plane. But a new analysis reveals deep flaws in that simple conclusion

Long ago, the cosmos might have been a black hole factory—and these primordial objects are even weirder than you think

A major defense against everything space throws at us, Earth’s magnetic field may even protect the moon from damaging galactic cosmic rays

Just how big can a star become? The answer depends on when in cosmic history you’re asking the question

This enormous chain of hundreds of galaxies—a cosmic filament—is twisting through space 400 million light-years away

Physicists cannot access anything that existed before the start of time and space, but they have theories

You might think galaxies can’t ever find each other in our runaway cosmos, but it turns out gravity can sometimes overcome even the stretching of space itself

Dating to only a billion years after the big bang, JADES-ID1 may be the earliest, most distant galaxy protocluster astronomers have ever seen

The puzzle of time remains one of the most persistent obstacles to a unified theory of physics

The six-year results from the Dark Energy Survey highlight unresolved tensions in standard cosmological theory