Galaxies
Galaxies are vast systems of stars, gas, dust, and dark matter that are held together by gravity. They come in a variety of shapes and sizes, ranging from small dwarf galaxies to massive elliptical galaxies. The study of galaxies involves understanding their formation, evolution, and properties, as well as their interactions with other galaxies and the larger cosmic environment. Astronomers use a variety of tools and techniques, including telescopes, computer simulations, and gravitational lensing, to study galaxies and their properties.
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