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Herschel
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The European Space Agency satellite Herschel in a clean room at the European Space Research and Technology Centre (ESTEC), Noordwijk, Neth.
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The European Space Agency satellite Herschel in a clean room at the European Space Research and Technology Centre (ESTEC), Noordwijk, Neth.
The European Space Agency satellite Herschel in a clean room at the European Space Research and Technology Centre (ESTEC), Noordwijk, Neth.

Herschel

space telescope
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Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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Article History

Herschel, European Space Agency space telescope, launched on May 14, 2009, that studied infrared radiation from astronomical objects. It was named in honour of German-born British astronomer Sir William Herschel, who discovered infrared radiation in 1800. Herschel was launched on an Ariane 5 rocket that also carried Planck, a satellite that studied the cosmic microwave background. Herschel was the largest telescope launched into space. Its primary mirror was 3.5 metres (11.5 feet) across. Herschel had three instruments: a high-resolution spectrometer that operated in two bands to observe light with wavelengths from 157 to 212 micrometres and from 240 to 625 ...(100 of 502 words)

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