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Nobody discovered the universe. We have always known that the universe exists. Discoveries of how the universe works and what it is have been made by many people.
It's about 381 billion(381,000,000,000) centimeters from Earth to the Moon.
The average distance from Earth to the Moon is about 384,400 kilometers (384,400,000 meters or 38,440,000,000 centimeters).
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As of now, scientists have identified and confirmed the existence of over 4,000 exoplanets in our universe. However, the total number of worlds in the universe is impossible to determine as the universe is vast and constantly expanding.