Two NASA astronauts to step outside International Space Station for 7 hours on June 30 | What we know

Two NASA astronauts will step outside the International Space Station for a 7-hour spacewalk on June 30. They will replace a faulty wrist joint on Canadarm2, a critical piece of equipment that has been operating for over 25 years. Preparations are already underway, with astronauts testing spacesuits and reviewing repair simulations.