The word "Universe" refers to the entirety of existence, encompassing all matter, energy, space, and time. It represents the vast cosmos, including galaxies, stars, planets, and everything that exists within them. The Universe is believed to have originated around 13.8 billion years ago in a Big Bang, expanding ever since. It follows certain physical laws and principles, allowing the formation of celestial bodies and the possibility of life. Yet, despite the significant advances in scientific knowledge, the Universe still holds many mysteries, such as dark matter and dark energy, challenging researchers to continually explore and unravel its secrets.