Basically, things tend to get scattered about and disorganized by nature, and it always takes more energy in the long run to get them packed together and/or organized again. So ultimately, everything tends to run out and just sort of cool down and fade away. Even things like planets. Life on Earth can keep going on as long as the Sun continues to function roughly how it does now, but that won’t go on forever because the Sun is constantly running out of fuel.
Latest Answers