SpaceX's Falcon 9 rockets, which have flown nearly 90 times this year, are now causing astronomers to worry about the impact that they are making on the Earth's ionosphere. After launching its payload into space, the Falcon 9 fires up its Merline engines to reorient itself and reduce its speed for landing on land or in the sea. Similarly, after the second stage has finished its mission, it also fires up its engines to return to Earth. These engines create holes in the ionosphere, a layer of charged gas surrounding the Earth that plays a crucial role in satellite communication. […]
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