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Two boys back to back measuring head height difference
Measuring Accurately

The Wilkinson Microwave Anisotropy Probe measures the differences in temperature of the Cosmic Microwave Background Radiation between two different points in the sky rather than the absolute temperature values themselves. This is because differential measurements of the CMB are much more accurate than absolute measurements.

Site link: Measuring Accurately

Credit: NASA / WMAP Science Team

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WMAP # 081012

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