Grooves found on Lutetia, an asteroid encountered by ESA’s Rosetta spacecraft, point to the existence of a large impact crater on the unseen side of the rocky world.
Rosetta flew past Lutetia at a distance of 3168 km in July 2010, en route to its 2014 rendezvous with its target comet.
The spacecraft took images of the 100 km-wide asteroid … Read the rest of this article





