This tiny saturnian moon may be, pound for pound, the most valuable piece of real estate in the solar system.
Previously known as Ultima Thule and now officially named Arrokoth, this landmark flyby passed the farthest object that any craft has ever visited.
Voyager 2 is still going strong, more than 40 years after launch.
Astronomers missed the asteroid until it was nearly on top of us, but the space rock passed harmlessly by.
The planet has an upper atmosphere some 10 times hotter than any other world yet measured, which astronomers think is causing heavy metals to stream away from the planet.
Ironically, by finding two galaxies severely lacking in dark matter, researchers have made a compelling case for the existence of the mysterious material.
Thanks to this unprecedented look into the early lives of binary stars, researchers have gotten a glimpse into the complex formation of the most common stellar setup.
The extremely energetic gamma rays originated thousands of light-years away, and scientists still aren’t exactly sure what generated them.
After decades of theorizing about the possibility of catching a black hole image, astronomers finally pulled it off. The results offer new insights into the mysterious objects.
