Explanation:

Astronaut Peggy Whitson has set a new space record for most days in space by a US astronaut. She has broken the previous record set by Jeff Williams who had spent a total of 534 days in space. President Trump congratulated her through a video chat between White House and the ISS. Peggy Whitson, at present, is serving as the Space Station Commander of Expedition 51. She was recently launched to the ISS in November 2016 using a Russian Soyuz capsule. At the time of her launch, she had already accumulated 377 total days in space. At the time of her return back to Earth, she would have accumulated more than 600 days in space.