Galaxies, vast collections of billions of stars, gas, and dust held together by gravity, are scattered across the immensity of space. But every so often, a coincidence occurs: Two galaxies line up from our point of view on Earth (or from a space telescope) and appear to overlap in the sky.

Source: [NASA](https://science.nasa.gov/get-involved/citizen-science/help-overlap-zoo-reveal-cosmic-dust/)

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