I'm sorry, I lied. We don't really know how the universe will end. Will the universe end with a whimper, will it end with a bang, or will it end with a crunch?
Here's what we know. The universe is essentially flat. How close to flat is the question. let's say the flatness is one. If we make the flatness just a little bit less than 1, we will call that an open universe which means that eventually gravity will lose out to the expansion of the universe. However, if we may be fun is to be loved a greater than 1, we call that close universe and eventually gravity will overtake the expansion of the universe, and we will start to shrink again.
How do we determine if the universe is open, closed, or flat? We look at something called the critical density of the universe. Now the critical density is basically all the energy and mass required to make the universe flat. If we compare the actual density of the universe to the critical density that's where we get the value of one. If the actual density is less than the critical density, the ratio between the actual density to the critical density will be less than one and we will have an open universe again this means that gravity will lose out to the expansion of the universe. If the actual density is greater than the critical density, gravity will eventually win out.
Next time we'll talk about the curvature of the universe and how that relates to being open, closed, or flat. Each of these three types of universes will result in a different type of ending of the universe, or for two of them, there actually would be no ending. but don't worry, earth and the solar system will be long gone by time universe really does end.
Here's what we know. The universe is essentially flat. How close to flat is the question. let's say the flatness is one. If we make the flatness just a little bit less than 1, we will call that an open universe which means that eventually gravity will lose out to the expansion of the universe. However, if we may be fun is to be loved a greater than 1, we call that close universe and eventually gravity will overtake the expansion of the universe, and we will start to shrink again.
How do we determine if the universe is open, closed, or flat? We look at something called the critical density of the universe. Now the critical density is basically all the energy and mass required to make the universe flat. If we compare the actual density of the universe to the critical density that's where we get the value of one. If the actual density is less than the critical density, the ratio between the actual density to the critical density will be less than one and we will have an open universe again this means that gravity will lose out to the expansion of the universe. If the actual density is greater than the critical density, gravity will eventually win out.
Next time we'll talk about the curvature of the universe and how that relates to being open, closed, or flat. Each of these three types of universes will result in a different type of ending of the universe, or for two of them, there actually would be no ending. but don't worry, earth and the solar system will be long gone by time universe really does end.
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