This mission marks Williams' third trip to the ISS and, by the time he returns, he will hold the record for total time in space -- a whopping 534 days spent outside the Earth's gravitational confines. The current 520-day record is held by astronaut Scott Kelly, who just got back from orbit at the start of the month.

Update: The launch was successful, and the Soyuz craft is on its way to the ISS, watch the replay below, and tune back in for a live stream of the docking process at 10:30PM ET.