Question

which of the following statements best describes the big bang theory? a all matter in the universe has always existed and formed objects such as stars and galaxies. b all space, matter, energy, dark matter, and dark energy in the universe began at a single point 13.8 billion years ago and have been expanding and evolving ever since. c the universe has a center, and all space, matter, energy, dark matter, and dark energy are evenly spread out from this center. d the universe is unchanging and will continue to exist as it is for all time.

Explanation:

The Big - Bang theory posits that the universe originated from a singularity about 13.8 billion years ago and has been expanding and evolving since then. Option A is a steady - state view, option C is incorrect as the universe has no center in the context of the Big - Bang, and option D is also a non - evolving view.

Answer:

B. All space, matter, energy, dark matter, and dark energy in the universe began at a single point 13.8 billion years ago and have been expanding and evolving ever since.