--post by SMK KEAT HWA ASTRONOMY SOCIETY--
The Universe is a vast expanse of space which contains all of the matter and energy in existence. The Universe contains all of the galaxies, stars, and planets. The exact size of the Universe is unknown. Scientists believe the Universe is still expanding outward. They believe this outward expansion is the result of a violent, powerful explosion that occurred about 13.7 billion years ago. This explosion is known as the Big Bang. By looking at an object's electromagnetic spectrum, scientists can determine if an object is moving away from Earth or towards Earth.
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