The European Space Agency's Planck satellite, scheduled for launch in 2007, will measure the polarization of the cosmic microwave background radiation to an angular resolution of 10 arcminutes or better, not 10 degrees as was stated in the News Feature of 21 June (see Nature 411, 880–881; 2001). Nature apologizes for this error, which was introduced during editing.
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The online version of the original article can be found at 10.1038/35082152
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Correction. Nature 412, 263 (2001). https://doi.org/10.1038/35085725
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DOI: https://doi.org/10.1038/35085725
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