The Universe

Quirks of orbital mechanics make a cadre of sun-orbiting asteroids appear to be moons of Earth

Snapshots of a plethora of planet-forming disks offer more than just eye candy—they also reveal some fundamental aspects of how worlds are born

The scale of the cosmos exceeds the bounds of human comprehension. But that doesn’t mean the universe is beyond our understanding

Maps of stellar motions can show whether the Milky Way will someday merge with the Andromeda galaxy—and a whole lot more

Without adding an extra day to February every four years, our calendar would get increasingly out of sync with the cosmos

Despite being some six billion kilometers away, the sun from Pluto would be a dazzling sight to behold—carefully, that is

Images of possible planets around white dwarf stars suggest that some gas-giant worlds survive the deaths of their stellar host

The popular limit of a 100-kilometer altitude for the edge of space should probably be adjusted down to 80 km

The edge of the world is closer than you think, and simple geometry proves it

Glowing methane on a brown dwarf dozens of light-years from Earth may signal the presence of a large lunar companion

Our planet’s precession is scarcely noticeable during anyone’s lifetime, but across history, it has had enormous effects

Here’s a calendar of cosmic events to keep your eyes on in the coming year