The Soyuz MS-26 and MS-27 crew ships are preparing to undock from the International Space Station (ISS).NASA astronaut Don Petitt and Roscosmos cosmonauts Alexey Ovchinin and Ivan Vagner are returning to Earth aboard the Soyuz spacecraft.The spacecraft will undock from the ISS's Rassvet module at 5:57 p.m. EDT and land in Kazakhstan at 9:20 p.m.NASA will provide coverage of the deorbit burn, entry, and landing on NASA+.