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An Eight Minute Ride To Orbit
Washington (AFP) Jun 28, 2006 The US space shuttle powers into orbit 10 times faster than a speeding bullet, reaching space just eight minutes and 40 seconds after lifting off from the Kennedy Space Center in Cape Canaveral, Florida. Seven astronauts will be propelled into space Saturday aboard the Discovery shuttle for a mission to the International Space Station (ISS). Six seconds before the launch, the shuttle's three engines are fired up, followed by the two rocket boosters. A 3.5-tonne force takes the spacecraft from zero to 28,968 kilometers (18,000 miles) per hour in a few minutes. The shuttle, its pair of rocket boosters and huge external fuel tank weigh 2,053 tonnes. The apparatus reaches 160 kph (99 mph) in eight seconds and speeds to 1,600 kph (994 mph) in less than a minute. Two minutes after liftoff, the rocket boosters are jettisoned 45 kilometers (28 miles) above sea level as the shuttle flies at 4,800 kph (2,980 mph). The rockets deploy parachutes to slow their fall into the Atlantic 200 kilometers (125 miles) from the coast, where NASA boats fetch them to use them again. The shuttle's three engines stay on during the eight minutes and 40 seconds it takes to reach orbit, consuming 1.9 million liters (500,000 gallons) of fuel from the orange-hued external fuel tank. The spacecraft burns the equivalent of a medium-sized swimming pool every 25 seconds. The fuel consists of liquid hydrogen kept at a temperature of minus 252 C (minus 422 F) and liquid oxygen. The hydrogen-oxygen mix can reach a temperature of 3.3 C (38 F) and produces steam that can be seen in the form of plumes of white smoke around the shuttle during liftoff. Once in orbit, the shuttle's engines are shut down as it travels at eight kilometers (five miles) per second. The external fuel tank is jettisoned and falls into earth's atmosphere where it disintegrates above the Pacific. Free of its fuel tank and rockets, the shuttle weighs 121.5 tonnes after consuming 1,600 tonnes of fuel to reach orbit. About 35 minutes later, two small engines to the left and right of the shuttle's tail are switched on to carefully maneuver the spacecraft toward the International Space Station.
Source: Agence France-Presse Related Links International Space Station
US To Make New Bid To Get Shuttle Back In Space
Washington (AFP) Jun 28, 2006NASA is counting down to the Discovery shuttle's launch on Saturday, a critical mission for the space program's future in just the second flight since the Columbia tragedy. Despite new warnings from engineers, six American astronauts and one German will lift off from the Kennedy Space Center in Florida, to resupply the International Space Station (ISS) and test shuttle safety procedures in a mission lasting nearly two weeks. |
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