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- In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert...187 KB (25,128 words) - 00:59, 6 August 2024
- The cosmic microwave background (CMB or CMBR) is microwave radiation that fills all space in the observable universe. It is sometimes called relic radiation...107 KB (13,144 words) - 01:24, 14 August 2024