Astronomers have been discovering the presence of terrestrial exoplanets (meaning rocky ones, like Mercury, Venus and Mars) around nearby stars for some time now, but aside from deducing their basic chemical makeup researchers can’t be sure if all the ingredients needed to make up a habitable, Earth-like world are presentread more

On April 15, 2018, asteroid 2018 GE3 set a record as the largest-known asteroid of its size to make a close pass to the Earth–and at less than half the distance between the Earth and the Moon, that’s a fairly close shave. The 48 to 110 meter (157 to 361-foot) object is between three to six times the size of the object that exploded over Chelyabinsk, Russia in 2013.

2018 GE3 was only spotted by the Catalina Sky Survey the day before its close, 193,000-kilometre (120,000-mile) pass, moving at 29.5 km/s, or 66,000 mph. As it whizzed away from us it passed even closer to the Moon, only one-third the distance between La Luna and Terra Firma.
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