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Even though the fabric of space is expanding throughout the universe, our solar system is not. Our atoms remain the same size. So do the planets, moons, and stars, as well as the distances separating them. Even the galaxies in our Local Group aren't expanding away from one another. The math tells about the possible solutions, but it is necessary to look to ...


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tl;dr Because space doesn't contract inside our Solar System. Wavelength increase is proportional to space expansion The prediction of general relativity — one of the most thoroughly tested and succesful theories — is that the wavelength of observed light changes in proportion to the factor by which space expands (Lemaître 1927). If space expands by a ...


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The electromagnetic spectrum is a continuous distribution of frequencies/wavelengths. Photometry is the science of light as perceived by the human eye, so it is very relevant for observing astronomical objects with telescopes, etc... In astrophotometry, one cuts the electromagnetic spectrum into bins, called "magnitudes." The specific ranges of ...


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