An asteroid just flew by Earth about 50% closer than the moon, and we barely saw it coming

An asteroid just flew by Earth about 50% closer than the moon, and we barely saw it coming

The roughly 100-foot-long space rock was about the same size of the meteorite that exploded over Chelyabinsk, Russia in 2013. Source: An asteroid just flew by Earth about 50% closer than the moon, and we barely saw it coming

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Earth and Its Moon, as Seen From Mars

Earth and Its Moon, as Seen From Mars

This composite image of Earth and its moon, as seen from Mars, combines the best Earth image with the best moon image from four sets of images acquired on Nov. 20, 2016, by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter. Source: http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21260  

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