
The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. The Universe is immense, estimates suggest at least two trillion galaxies. It comprises all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space. The universe also includes the physical laws that influence energy and matter, such as conservation laws, classical mechanics, and relativity. Most galaxies are between 10 billion and 13.6 billion years old. Our universe is about 13.8 billion years old, so…
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