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Caption: Hubble observed that galaxies move away from each other more rapidly the more distant they are. In 1929, he formulated a law that states that the speed at which galaxies move apart increases as a function of distance. A simple analogy shows how this phenomenon works: imagine a sphere containing galaxies.
Credit: Album / Universal Images Group
Image size: 3656 × 1970 px | 20.6 MB
Print size: 31.0 × 16.7 cm | 1439.4 × 775.6 in (300 dpi)