Final answer:
The universe is best described as the sum total of all matter and energy, containing approximately 10^11 galaxies, each with a vast number of stars.
Step-by-step explanation:
What best describes the universe? The most accurate description is A) the sum total of all matter and energy. This encompasses everything that exists and is accessible to our observations, including stars, galaxies, and other celestial bodies, as well as dark matter and dark energy.
The universe contains approximately 1011 galaxies, each with their own vast number of stars (over 1011 stars in an average galaxy), similar to how our Milky Way Galaxy has a large number of stars and significant structure. The idea of the multiverse extends beyond our universe, suggesting there may be countless other universes with different physical laws.