Replacement Suit News Today

Orbiting international space station. >> failure of an internal flow control valve. >> reporter: to american astronauts are venturing out. their mission? to replace a pump needed to cool the vessel. >> i dont know if you guys believe in miracles, but i got the hitch pin on the first try. >> thats awesome, rick. >> reporter: offer the weekend, astronauts rick mastacchio and mike hop kins, cooling fluid, ammonia. >> hooking up the big heavy ammonia lines are massive. if you were to leak ammonia, n...