Astrophysics

ORCs—odd radio circles—are one of the weirdest recent discoveries in the heavens above

NASA’s James Webb Space Telescope provided a closer look at the aftermath of a star that wreaked violence on its planet

At the lower end, and to the bitter end, defining a star is tougher than you might expect

According to new simulations, many, even most, planets get ejected from their star early in their history

The next year of science on the James Webb Space Telescope has been announced amid mounting budgetary uncertainty that could affect the unparalleled observatory

The spins of some early galaxies could be a clue that the entire observable universe exists within a black hole—except, that is, for all the evidence to the contrary

A long-simmering disagreement over the universe’s present-day expansion rate shows no signs of resolution, leaving experts increasingly vexed

The final results from the Atacama Cosmology Telescope offer the sharpest, most sensitive view of the early cosmos that anyone has ever seen

Flickering loops in the sun’s corona may appear before dangerous solar activity

New simulations suggest that habitable worlds could have begun forming only 200 million years after the big bang

NASA’s SPHEREx mission will survey the entire sky in 102 different “colors” of light, offering scientists an unprecedented look at the earliest days of the universe and much more

It’s neither fast nor food, but a spectacular object called HH 30 looks appetizing for astronomers in a new image from the James Webb Space Telescope