On July 24, 2012 Russian Progress M-15M unmanned supply spacecraft failed to re-dock with the International Space Station (ISS) due to certain problems in the freighter's new Kurs-NA rendezvous system. The unmanned Progress M-15M, which arrived at the ISS in April, undocked from the station on July 22 to conduct a series tests of the upgraded Kurs-NA rendezvous system. The Kurs-NA system warned of a possible emergency situation and called off the re-docking when the Progress M-15M was approaching to the ISS. The Kurs-NA rendezvous system went smoothly at the beginning, but the system issued a command to stop further operations at 4:22 a.m. Moscow time (00:22 UTC) when the freighter was at a distance of 161 kilometers to the ISS. The Russian space agency promised the incident would not lead to a delay of the Japanese spacecraft HTV-3's docking with the ISS on July 27. Another attempt to dock the Progress M-15M to the ISS
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After a 17-month battle with pancreatic cancer, Sally Ride, the first U.S. female astronaut passed away on July 23, 2012 in San Diego, California, at the age of 61.
Sally Ride, who joined U.S. space agency NASA in 1978, became in 1983 the first American woman in space as a crew member on Space Shuttle Challenger. She was also the youngest American space traveler at the time. One of her
hobby was stamp collecting.
On July 22. 2012 at 20:25 UTC (July 23 at 00:25 Moscow time) the Russian "Progress M-15M” undocked from the International Space Station. It is planned to dock the spacecraft with the ISS again to test an upgraded Russian "Kurs” docking system.