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The image above is a picture of what the world looks like from the perspective of a soap bubble. The vast majority of our planet is covered in a layer of gas and dust called the interstellar medium. Most of the planet's topography is, at most, a few hundred km thick. Hot gases, such as hydrogen and helium, infuse the interstellar medium with energy, creating enormous structures known as galaxies. Gas clouds, such as stars and our Sun, are born in these clouds and eventually fall into galactic arms, where they are crushed together by gravity until they coalesce into stars and planets.
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