The Biggest Crater Known Was From an Asteroid That Made the Dinosaur Killer Look Like a Pebble

Billions of years ago, Jupiter's planet-sized moon Ganymede got a helluva whack: Looking over data from probes that have visited the moon, scientists estimate it got hit by an object a staggering 300 kilometers wide.  #Astronomy https://www.syfy.com/syfywire/the-biggest-crater-known-was-from-an-asteroid-that-made-the-dinosaur-killer-look-like-a


Jupiter’s moon Ganymede, showing the dark and light terrains; the furrows can be seen to the upper right in the dark terrain. Credit: NASA / JPL-Caltech / Emily Lakdawalla

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