NASA astronauts Tracy C. Dyson and Matt Dominick will conduct a spacewalk on Thursday, June 13, with the primary objective of collecting samples from the exterior of the International Space Station (ISS) to determine the presence and resilience of microorganisms. The spacewalk, designated as U.S. spacewalk 90, will be the fourth for Dyson and the first for Dominick. Viewers can follow the live stream of the spacewalk on NASA’s website, YouTube channel, and other official platforms starting at 6:30 a.m. ET, with the spacewalk itself scheduled to begin at 8 a.m. ET. The spacewalk is expected to last approximately six and a half hours.