Question

The Big Bang theory predicted * Choose one or more: A. the cosmological principle. B. the cosmic microwave background radiation. C. the abundance of helium. D. that the sky should be dark at night. E. Hubble's law. F. the period-luminosity relation of Cepheid variables.

Answer 1

The Big Bang theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution.The model describes how the universe expanded from an initial state of very high density and high temperature,[4] and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, large-scale structure, and Hubble's law – the farther away galaxies are, the faster they are moving away from Earth.

"dark night sky paradox", is the argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. In the hypothetical case that the universe is static, homogeneous at a large scale, and populated by an infinite number of stars, then any line of sight from Earth must end at the (very bright) surface of a star and hence the night sky should be completely illuminated and very bright. This contradicts the observed darkness and non-uniformity of the night.The darkness of the night sky is one of the pieces of evidence for a dynamic universe, such as the Big Bang model.Cepheid variables could be found from BB theory