Oceanographer-turned-astronaut Megan McArthur has taken some pretty stunning pictures of Earth from the International Space Station, which she then posts on her @Astro_Megan Twitter feed. Her many photographic subjects include Craters of the Moon National Monument in Idaho and the astonishing red fingers of the Betsiboka River estuary in Madagascar, colored that way because of over-logging and erosion. In October, near the end of a six-month stay on the station, McArthur spied something she'd never seen-an airplane in flight, its contrails showing clearly against the umber and ocher ground below. "It made me laugh out loud to realize I was spotting an airplane in flight while taking photos over Alberta, Canada today," she tweeted. "I guess it was nice to see evidence of other humans moving around Planet Earth." "Where ya headed, friends?" she asked.
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