Peggy Whitson is now the oldest woman to orbit Earth.
The 56-year-old NASA astronaut arrived at the International Space Station on Saturday.
That just beats the previous record-holder, Barbara Morgan, who was 55 when she went to space.
She even holds the record for most time in space among female astronauts –– which actually made getting cleared this time more difficult, since NASA limits how much radiation astronauts are exposed to.
By the end of her mission, Whitson should break another record: Most days spent in space by an American, regardless of gender.