Mass extinction, nuclear fallout, a global economic crash, robots taking over - these are all possibilities that could destroy humanity’s survival in the future. There are many things that could naturally lead to the extinction of Homo sapiens (the species name for humans). In trillions upon trillions of years, the universe will theoretically reach its thermodynamic equilibrium and all movement, including atomic collisions, will stop - meaning all life will go extinct in the whole universe. In approximately five billion years, the Sun, which is currently a main sequence star, will move into the next phase of its life and become a red giant. It will enlarge as nuclear fusion slows and will envelope the Earth into its fiery core - causing the extinction of all life on Earth and many of the surrounding planets.