Knowledge From Observations

THE UNIVERSE  The universe is an incredibly vast and complex entity that has fascinated humans for thousands of years. It is defined as the totality of all matter, energy, and space that exists. Scientists estimate that the universe is approximately 13.8 billion years old and is constantly expanding. It is made up of billions of galaxies, each containing billions of stars and planets. One of the most remarkable features of the universe is its size. The observable universe is estimated to be around 93 billion light-years in diameter. This means that light takes 93 billion years to travel from one end of the universe to the other. The universe is also incredibly diverse, with an unimaginable number of different types of stars, planets, and other celestial bodies. Our own solar system is just a tiny part of the universe. It consists of the Sun, eight planets, and numerous other objects such as asteroids and comets. Each planet in our solar system is unique, with its own characteristic...