Photographers working in the universe

With cameras and telephoto tubes, an astronaut on the International Space Station observes the earth to capture beautiful scenes.

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Astronaut Chris Cassidy pointed the camera and telephoto tube to Earth from the International Space Station. (Photo: NASA)

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Countless grooves on the giant sand dunes appear in a photograph taken by American Mars Reconnaissance. (Photo: NASA)

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The infrared image of a storm swept through the US on June 12. (Photo: NOAA)

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A clear picture of the stones on Mars is taken by the Opportunity Autonomous Device. (Photo: NASA)

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The constellation NGC 3766, about 7,000 light-years from Earth, is like sparkling diamonds. Astronomers discovered that the brightness of 36 stars in this constellation changed dramatically. They predict they are a kind of stars that people never knew. (Photo: ESO)

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Mercury surface in a photo taken by the Messenger ship. (Photo: NASA)