The Universe

Although astronomers have found thousands of exoplanets, the number of confirmed exomoons—and exorings—is still zero. But that may soon change

How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think bigger

The collision of supermassive black holes shakes the entire cosmos, hard

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

The venerable Hubble observatory is going strong despite its decades in space and the advent of next-generation successors

From planet-scorching stellar outbursts to cataclysms so powerful they shiver the very fabric of spacetime, these are some of the biggest blasts our cosmos has to offer

Stars emit lots of green light, but our eyes don’t let us see them that way

Total eclipses, lunar occultations, planetary conjunctions and meteor showers await stargazers this year

The “Seven Sisters” of the Pleiades are part of a much larger complex that can help reveal our galaxy’s deep history

Record-breaking objects can tell us about the most powerful events in the cosmos—sometimes

Depending on how you look at it, this catchphrase from a 1980s pop song is decently accurate: you can actually melt the planet if you stop its turning

Precisely calibrating clocks on Mars is harder than you’d think, because of some extremely esoteric physics