It’s time to speak out against the unchecked growth of satellite megaconstellations
Satellites are wonders of modern technology that have improved all of our lives. But having more than a million of them in orbit could destroy our view of the heavens and seriously damage our planet
How far are we from finding exomoons and exorings?
Although astronomers have found thousands of exoplanets, the number of confirmed exomoons—and exorings—is still zero. But that may soon change
Could aliens in another galaxy see dinosaurs on Earth?
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
How much energy is released when supermassive black holes collide?
The collision of supermassive black holes shakes the entire cosmos, hard
How can galaxies ever collide in an ever-expanding universe?
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
After all these years, the Hubble Space Telescope is still awesome
The venerable Hubble observatory is going strong despite its decades in space and the advent of next-generation successors
The biggest explosions in the universe, ranked
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
For Stars, It’s Not Easy Being Green
Stars emit lots of green light, but our eyes don’t let us see them that way
The Year in the Sky: 2026’s Most Noteworthy Celestial Events
Total eclipses, lunar occultations, planetary conjunctions and meteor showers await stargazers this year
The Pleiades Star Cluster Has a Secret Stellar Family Scattered across the Milky Way
The “Seven Sisters” of the Pleiades are part of a much larger complex that can help reveal our galaxy’s deep history
What’s the most distant galaxy? And why does it matter?
Record-breaking objects can tell us about the most powerful events in the cosmos—sometimes
If I Stop the World, Will I Melt with You?
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