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You may want to check the Wikipedia article on the Big Bang, or science videos on YouTube, for more details; but briefly, the evidence is as follows:* According to calculations based on General Relativity, the Universe can't remain static for long - it must needs expand or contract eventually.

* Similarly, the Second Law of Thermodynamics doesn't allow a static Universe. Entropy increases; there are irreversible processes.

* The redshift of distant galaxies. The only reasonable explanation of this redshift is that the galaxies are moving away from us. This is related to,but not exactly the same, as the Doppler effect.

* The mix of elements and isotopes in the current stage of the Universe closely matches theoretical calculations based on the Big Bang.

* The cosmic microwave background radiation closely matches that which is expected from the Big Bang model. It is a remnant of the time when the Universe cooled below about 3000 K.

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Q: What are peices of evidence for the big bang therory?
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What episode of the big bang therory has little lalita?

The Grasshopper experiment


Is the big bang therory for preteens?

Yes. (See related question below for more information.)


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yes it will happen again after the big crunch then of course, the big munch..... At present there is no evidence that another Big Bang will occur.


Is the red-shift responsible for the big bang theory?

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It is not so much that the universe is expanding, but rather the rationalization for its expansion that provides evidence to support the Big Bang Theory. The Big Bang supports interpreted observational evidence of the Cosmic Microwave Background Radiation (CMBR) barrier that there is an evolutionary expansion of the universe which promotes a finite age for the universe.