The universe includes stars (such as the Sun), planets, moons, and nebulae. The earth is one of eight planets orbiting the sun. Our solar system lies on the Milky Way Galaxy, one perhaps a trillion galaxies in the universe. As the Universe expands, galaxies move away from one another. Why, when you look at the night sky, do you see the past?
Question-based on, "night sky and past"
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The universe includes stars (such as the Sun), planets, moons, and nebulae. The earth is one of eight planets orbiting the sun. Our solar system lies on the Milky Way Galaxy, one perhaps a trillion galaxies in the universe. As the Universe expands, galaxies move away from one another.
Why, when you look at the night sky, do you see the past?
The Universe is made up of billions of galaxies that are in a constant state of relative motion. From inception of the Universe during the Big Bang, as the Universe ages, the heavenly bodies are constantly moving away from each other at a finite speed. Such relative motion has been attributed to the presence of dark matter in the Universe. By observing distant galaxies, stars, and their planetary systems, humans have been able to identify habitable planets that will be able to be colonized in the future.
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