Astronomers have observed that the universe is expanding and is accelerating in all directions. Using this evidence, astronomers
have hypothesized that a huge explosion called the big bang created the universe. Which of the following correctly describes the big bang? theory
fact
opinion
none of these
It wasn't until the 16th century that the Polish mathematician and astronomer Nicolaus Copernicus presented the heliocentric model of the Solar System, where the Earth and the other planets orbited around the Sun
