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https://de.wikipedia.org/wiki/Spitzer-Weltraumteleskop
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https://en.wikipedia.org/wiki/Spitzer_Space_Telescope
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https://hu.wikipedia.org/wiki/Spitzer_űrtávcső
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https://cxc.harvard.edu/
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https://chandra.harvard.edu/
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https://www.nasa.gov/mission/chandra-x-ray-observatory/
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https://ru.wikipedia.org/wiki/Чандра_(телескоп)
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https://de.wikipedia.org/wiki/Chandra_(Teleskop)
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https://en.wikipedia.org/wiki/Chandra_X-ray_Observatory
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https://hu.wikipedia.org/wiki/Chandra_űrtávcső
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