Interesting facts about universe... must know

The universe is estimated to be around 13.8 billion years old. The universe contains billions of galaxies, each containing billions of stars and other celestial objects. The Milky Way, which is the galaxy that our solar system is a part of, is estimated to contain 100-400 billion stars. The largest known structure in the universe is the Hercules-Corona Borealis Great Wall, which is a cluster of galaxies that spans approximately 10 billion light-years. The universe is thought to be expanding, with galaxies moving away from one another. Dark matter and dark energy are two mysterious substances that make up the majority of the universe's total mass-energy. Scientists believe that the universe began with the Big Bang, a massive explosion that occurred approximately 13.8