Which one of the following hypothesis/theory explains the origin of th

Which one of the following hypothesis/theory explains the origin of the universe ?

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Nebular hypothesis

Binary theory

Big Bang theory

Planetesimal hypothesis

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This question was previously asked in

UPSC NDA-2 – 2019

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The Big Bang theory is the most widely accepted cosmological model explaining the origin and evolution of the universe. It postulates that the universe originated from a singular point of extremely high density and temperature approximately 13.8 billion years ago and has been expanding ever since. The other hypotheses listed explain the formation of stars, planets, or solar systems, not the entire universe.

Cosmology studies the origin, evolution, and structure of the universe. The Big Bang theory is the standard model in cosmology.

Evidence supporting the Big Bang theory includes the cosmic microwave background radiation, the observed expansion of the universe (Hubble’s Law), and the abundance of light elements (hydrogen, helium, lithium). The nebular hypothesis and planetesimal hypothesis are related to the formation of stars and planetary systems within the universe, not the universe itself.

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