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What will happen if the density of the universe is less than the critical density?

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What will happen if the density of the universe is less than the critical density?

(a) The Universe will contract

(b) The Universe will contract and then rebound

(c) The universe will stop expanding

(d) The universe will keep expanding forever
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Right option is (d) The universe will keep expanding forever

Best explanation: When the density of the nucleus is less than a certain critical density, the universe will keep expanding forever, like it is right now, till the end of the time.
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