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burned. The reason is that nearly everything in normal
              life depends on some kind of temperature difference,
              either directly or indirectly. For example, the local power
              plant sends electricity so that a computer works. The plant
              probably powers the turbine to produce electricity by
              heating water. And your body runs on food, which, without
              the huge temperature difference between the sun and the
              rest of our solar system, wouldn’t exist. However, once heat
              death affects the universe, there will be no heat difference
              in anything anywhere. Life, and other interesting things, will
              never be sustainable again.

              A second possibility for the end of the universe is that
              the universe is expanding. There is a lot of “stuff” in the
              universe, for example, matter and light, but we don’t really
              know how much stuff there is. This theory says that the
              expansion of the universe will decelerate and eventually
              stop if there’s too much stuff. It will then begin to contract. It
              will keep shrinking, getting hotter and denser, and end in an
              incredibly compressed inferno, known as the Big Crunch.






























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