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With continual observations:

Big Crunch: Galaxies would continue to appear blue shifted.
Big Rip: Galaxies would continue to appear be red shifted.

To Do: Well nothing, absolutely nothing, - nothing to loose any sleep over. Even if the "big crunch" was detected to occur, it wouldn't happen for at least 14 billion years.

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15y ago

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What is the difference between big bang theory and big crunch theory?

The big bang theory is the explosion that started the universe. Where as the big crunch is the theory where the universe will eventually contract and become increasingly clumped and eventaully all mater would collapse into black holes which would then coalesce producing a unified black hole or Big Crunch singularity.


On what grounds are astronomers able to say that the sun has about 5 billion years remaining in its main sequence stage?

We can crunch numbers. The sun's energy output can be calculated with a high degree of accuracy, and its mass can be calculated accurately as well. We know how much energy a fusion reaction (the proton-proton reaction, for instance) releases. It's just a big numbers game, but one we can play with a high degree of certainty.


When was the big crunch theorized?

From the 1940's until about 2000 when dark energy (or rather the acceleration of expansion) was discovered.


What is it called when the universe will collapse inward?

The collapse of the universe inward is called "the Big Crunch" hypothesis. It suggests that the expansion of the universe will eventually halt and reverse, leading to a collapse of all matter back into a hot, dense state. However, current observations suggest that the universe is actually expanding at an accelerating rate, which makes a Big Crunch less likely.


What are the best candies to use for a candy solar system model?

Airheads (planet), Starburst (planet), Laffy Taffy (planet), CRUNCH (asteroid belt)