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What is the universe?

The universe is the entirety of all matter, energy, space, and time. It is everything that exists, including all galaxies, stars, planets, asteroids, and other celestial bodies, as well as all forms of matter, energy, and radiation. The universe also encompasses the laws of physics that govern the behavior of matter and energy and the fabric of space-time itself.

The universe is thought to have originated with the Big Bang, a massive explosion that occurred approximately 13.8 billion years ago, and has been expanding and evolving ever since. Scientists believe that the universe is still expanding and that it contains an estimated 100 billion to 2 trillion galaxies, each containing billions of stars and planets.

The study of the universe is a vast and interdisciplinary field, encompassing astronomy, cosmology, physics, and mathematics, and it has led to many of the most profound and transformative discoveries in science. Despite the great advances that have been made in our understanding of the universe, there is still much that remains unknown and mysterious, making it one of the most exciting and captivating areas of scientific inquiry.
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