Universe

The Universe is made up of everything that surrounds people. Physical things, such as the stars, planets, or galaxies. The Milky Way is a spiral galaxy inside this Universe. It is unknown how old the Universe is, but scientists estimate is to be around 13.77 billion years. According to some scientists, the Universe was created by a Big Bang which allowed matter to spread out and for solar systems to form. Before the Big Bang, all matter in the physical Universe was packed down inside a small circular area. After pressure built up inside that sphere, a giant explosion happened, creating the Universe as we know it today. Some scientists believe that the Universe is still expanding from that Big Bang even to this day. They also believe that towards the end of time, the Universe will compress back down into the same shape it was before and then create a gigantic, magnificent black hole that will swallow up the physical Universe and destroy it.