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The reasons are still unclear
NASA again failed to launch the Boeing Starliner spacecraft.
The ULA Atlas V rocket was supposed to send a spacecraft with two astronauts to the ISS today, but the launch was canceled literally four minutes before takeoff.
The reasons are currently unknown. Last time the launch was canceled due to ground system valves and a helium leak. At the same time, ULA noted that they would not be able to completely eliminate the leak, so the launch would occur if there was one. Engineers noted that the risks were minimal.
If Boeing and ULA can fix the glitch, whatever it is, in time, they could make another launch attempt on Sunday (June 2) with a target launch time of 6:03 p.m. Moscow time.