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Most of our universe appears to consist of dark matter. The hot inflationary big bang theory does not currently account for this.

The rate of expansion of our universe is unexpectedly increasing. Again, the big bang theory lacks explanatory power for this phenomenon (attributed to "dark energy").

The theory DOES account for the synthesis of matter from and ever expanding cloud of energy (primordial nucleosynthesis--the origin of early hydrogen and helium). It explains the flatness of the universe, its homogeneity (inflation), and present observed temperature (cosmic microwave background radiation, CBR or MBR). The age of the universe has also been reliably determined to be 13.7 billion years.

The weaknesses are by no means sufficient to overturn the theory in favor of any superior competitor. None come remotely close, yet.

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Q: What are the weaknesses in the theory of the big bang?
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