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The universe is everything that exists: Earth, the sea, people, planets, germs, stars

Scientists largely agree that the universe appeared approximately 14 billion years ago. That is three times older than our Sun, and 210 times as far away from us in time as the disappearance of most dinosaurs. That event is called the Big Bang.

Today, the universe is still expanding: we know it because we see that most stars are moving away from us. We don't know for sure whether it will continue to do so, nor for how long. Since the total amount of matter and energy is believed to never change, the bigger the universe gets, the emptier and colder it becomes.