Even at its minimum estimated diameter, C/2014 UN271 is the largest Oort cloud comet discovered, being more than 50 times larger than a typical comet which is less than 2 km (1.2 mi) in diameter.

Jun 28, 2025 · Comet Bernardinelli-Bernstein is the largest comet ever observed from the Oort Cloud, which NASA describes as being like a big, thick bubble around the solar system.

Jun 26, 2025 · Bottom line: Astronomers have made new observations of the mega comet Bernardinelli-Bernstein. They’ve found the comet is erupting with jets as it barrels toward the sun.

Jan 24, 2024 · Following observations from the Hubble Space Telescope, NASA confirmed that the largest comet ever discovered has a diameter of approximately 85 miles and is now considered the …

Apr 19, 2022 · While Comet Bernardinelli–Bernstein, the most massive comet ever discovered, isn’t going to hit Earth on this current pass through the Solar System, the far future is anyone’s guess.

Jun 24, 2025 · Comet C/2014 UN271 (Bernardinelli-Bernstein) is the largest Oort Cloud comet ever detected, spanning a whopping 137 kilometers (85 miles) wide. For reference, that's almost 14 times …

While the internet has been buzzing over the mysterious 3i/Atlas, with some even speculating it could be an alien spacecraft rather than a natural comet, astronomers say the real celestial event...

Its meteor is the largest recorded object to have encountered the Earth since the Tunguska event. The Comet Shoemaker–Levy 9 impact provided the first direct observation of an extraterrestrial collision …

From between ten thousand years and one million years ago, and with a diameter of one km (0.62 mi) or more. The largest in the last one million years is the 14-kilometre (8.7 mi) Zhamanshin crater in …

Jan 23, 2025 · Sixty-six million years ago, a mountain-sized asteroid struck the tip of what’s now the Yucatán Peninsula of Mexico with an impact so disastrous it wiped out 70 percent of all species on …