@CNN: NASA astronaut Peggy Whitson is back on Earth – she spent 21 months in space, more than any other American or woman… https://t.co/as8G3Hn50V

@CNN: NASA astronaut Peggy Whitson is back on Earth – she spent 21 months in space, more than any other American or woman… https://t.co/as8G3Hn50V