Check out these photos of galaxies, planets and the discovery shuttle and many more.

看看这些拍摄银河系、行星以及探索者航天飞机的美妙照片吧！

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But, the space shuttle program has come to represent the success,and tragedy, of discovery at the limits of our world.

VOA: special.2011.07.27

On March twenty-second, NASA again ordered the astronauts on the linked space station and shuttle Discovery to move out of the way of another piece of debris from a rocket.

VOA: special.2009.04.01

"Booster ignition and lift off for space shuttle Discovery, taking the space station to full power for full science,"

VOA: standard.2009.03.15

The Discovery shuttle brought the new power unit to the ISS, docking with the platform late on Tuesday (GMT).

BBC: Spacewalkers bolt in power unit

But first, two NASA astronauts successfully completed a space walk today and removed two troubling pieces of ceramic fabric sticking out from the Discovery Shuttle's heat shield.

NPR: Shuttle Spacewalk Repair Mission a Success

Dr Patrick's first mission was as the robotic arm operator on STS-116 - a mission of the Discovery shuttle in 2006 to continue the construction of the International Space Station (ISS).

BBC: 'UK spaceman' Nicholas Patrick honoured