NASA Astronaut Frank Rubio Breaks US Record for Longest Spaceflight

Astronaut Frank Rubio is floating inside the cupola, the International Space Station’s "window to the world." NASA via AP

NASA astronaut Frank Rubio now holds the record for the longest U.S. spaceflight.

Mr. Rubio surpassed the U.S. space endurance record of 355 days on Monday at the International Space Station. He arrived at the outpost last September with two Russians for a routine six months. But their stay was doubled after their Soyuz capsule developed a coolant leak while parked at the space station.