Big Bang – Wiki: The Big Bang is basically a big explosion, no one really knows what it looked like before the Big Bang, but we do know that the Big Bang was an explosion and happened about 13.8 billion years ago. After the explosion(which was very big), the universe started expanding uncontrollably. The universe was extremely hot and dense. The expansion of the universe was backward in time using general relativity yields, an infinite density, and temperature at finite times in the past. It was so hot that all the rocks(in space) clumped together and formed planets, moons, stars, and other types of space objects. The Big Bang was qualified as the “birth” of the universe since it was basically the start of the actual universe. It also represents the time in history(of the universe) when the universe officially entered the law of physics that we understand and know. After the Big Bang, the universe started forming more and more black holes, while the universe kept on growing bigger and bigger. The Big Bang was rapidly expanding its size, and it’s still growing larger today. According to the Big Bang theory, the universe at the beginning was very hot and compact. And since then, the universe continues to expand and cool down. Now, our universe is cold, much colder than the most frigid winters we have on Earth. This is why astronauts have to wear space suits when they go into space. That prevents the astronauts from freezing to death. But before the universe started cooling down, the universe was very hot. That’s how all the rocks from the Big Bang began clumping together and forming all the planets and stars in our universe today(although most of the stars and turned into black holes now).

The ultimate fate of the Universe – Wiki: There are many kinds of ways for the universe to end: Big Freeze/Heat Death, Big Rip, Big Crunch, and Big Bounce(Big Slurp could be a grave threat to the universe, but cannot end the universe). Scientists have studied the universe and come up with these kinds of ways the universe might end. The theory for the ultimate fate of the universe was created by Albert Einstein. The end of the universe became possible to Einsteins’ 1915 theory of general relativity. General relativity is something to describe the universe at its largest scale. General relativity also helps cosmologists come up with other possible fates of the universe. In 1922, Alexander Friedmann came up with some possible ends, the same with Georges Lemaitre in 1927. In some of these solutions, the universe had been expanding from an initial singularity which is basically the Big Bang. In 1929, Edwin Hubble published his conclusion, which said that he observed distant galaxies and stars and concluded that the universe is still expanding. That said, it shows that the beginning of the universe and the end of the universe is a serious scientific investigations. The Big Freeze/Heat Death works like this; The universe continues its expansion, and as time passes by, the expansion results in zero temperature. The Big Freeze scenario works like a combination of itself and the Big Rip scenario. Like in the name, the universe will just freeze. The Heat Death works opposite of the Big Freeze, but that requires the right amount of temperature. The Big Rip work like this; The universe is expanding- expanding too much. The Big Rip will just work like a rip. The universe will get ripped apart due to its expansion. The Big Crunch will work like this; It will basically be a Big Bang but reversed.

Note: This is extra information for my Capstone video.