Whoops! The Earth's atmosphere is far bigger than we had realized, scientists have announced. The outermost part of our atmosphere reaches nearly twice as far as the Moon and is about 50 times as big as our own planet, new research has shown. “The Moon flies through Earth’s atmosphere,” says Igor Baliukin of Russia’s Space Research Institute, lead author of the paper presenting the results. “We were not aware of it until we dusted off observations made over two decades ago by the SOHO spacecraft.” At the boundary of own atmosphere and outer space, there is a cloud of hydrogen...