Astronomy

Slow-moving stars at the Milky Way’s outskirts suggest our galaxy may be far lighter than previously believed, with profound implications for dark matter

The European Space Agency says a software patch restored stability to its cosmos-mapping Euclid spacecraft — but slower operations could extend the mission

Of the thousands of stars visible to the eye, only a few hundred are known to have planets. But that number may be far higher in reality

At times, the enormous BlueWalker 3 telecommunications satellite is brighter than some of the most iconic stars visible from Earth

This annular solar eclipse will only reveal its full glory to a select few, but onlookers across much of the Western Hemisphere can catch a partial glimpse of the dazzling phenomenon

Astronomers have a new term to describe the pain associated with the loss of access to dark skies: noctalgia

The equinox is not when day and night have equal lengths. Instead it’s something more nuanced but no less glorious

A new NASA instrument allows researchers to view the bright and permanently shadowed portions of the moon’s Shackleton Crater at the same time

Thousands of spacecraft circle Earth. Seeing them from the ground is surprisingly easy—and a lot of fun

Earth is bombarded by millions of bits of cosmic debris every day. Here’s how to distinguish between the different types

A new interpretation of Isaac Newton’s writings clarifies what the father of classical mechanics meant in his first law of motion

The doomed class of stars named Wolf-Rayets produce mysterious pinwheel shapes