Abstract
Astronomical observations bridge distances so large that the time taken by the light in passing from its source to the observer exceeds by far the historical time span of observation itself. In addition, nearly all observations concern light. This situation requires a consistent theory of motion for speeds of the order of magnitude of the speed of light, and that theory is the theory of (special) relativity (special relativity theory, SRT).
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Liebscher, DE. Relativity. In: Cosmology. Springer Tracts in Modern Physics, vol 210. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-31502-5_2
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DOI: https://doi.org/10.1007/978-3-540-31502-5_2
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