Is it possible for the universe to collapse?
There are two main ways for an expanding universe to die: The cosmos could eventually collapse back in on itself, or it could continue inflating forever. If gravity overpowers expansion, the cosmos will collapse in a Big Crunch. If the universe continues to expand indefinitely, as expected, we’ll face a Big Freeze.
Can Gravity stop the expansion of the universe?
Short answer: yes, gravity slows the expansion of the universe, in the sense that we’d see even greater expansion if gravity* were (slightly) weaker, and everything else was kept the same.
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Will the universe end with a big freeze?
Astronomers once thought the universe could collapse in a Big Crunch. Now most agree it will end with a Big Freeze. If the expanding universe could not combat the collective inward pull of gravity, it would die in a Big Crunch, like the Big Bang played in reverse.
How does gravity affect the expansion of the universe?
We thought that gravity would slow the expansion and eventually stop the expansion and begin the contraction of the universe. But instead the universe began accelerating its expansion about 5 billion years ago. This accelerating of the expansion of the universe actually gives the universe a longer life.
What will happen to the universe when it dies?
Slowly, stars will fizzle out, turning night skies black. All lingering matter will be gobbled up by black holes until there’s nothing left. Finally, the last traces of heat will disappear. Rather than meeting its end through fire and brimstone, the cosmos will likely succumb to “heat death.”
What happens when the critical density of the universe is greater?
If the density of the universe is greater than the critical density, then gravity will eventually win and the universe will collapse back on itself, the so called �Big Crunch�, like the graph’s orange curve. In this universe, there is sufficient mass in the universe to slow the expansion to a stop, and then eventually reverse it.