Most astronomers believe the universe began about how many years ago?

The ______ is the main theory that explains the origins of the universe and how everything was made, including the stars and the planets.

Scientists think the universe was formed billions of years ago by an event called the _______.

The universe has no fixed edge which means that it has been ______ ever since the Big Bang.

The geocentric model states that the _______is the center of the Universe.

Aristotle and Ptolemy were two scientists who supported the _______ model of the universe in which planets, stars, and the Sun revolved around Earth.

The ______ model states that the Earth and other planets in our solar system revolve around the Sun.

Galileo supported the _______ model of the universe.

Galileo built an improved ______ which helped him to see far away and observe four moons orbiting Jupiter.

The Sun is the center of _________.

Galileo discovered with the use of his telescope four moons that orbited around Jupiter. This means that everything in the solar system could NOT have orbited around _____.

Georges Lemaître was a Belgian priest who proposed the ________.

Edwin Hubble supported the _______ Theory and made the observation that the universe is continuously expanding.

Nicolaus Copernicus proposed the ________.

The Big Bang Theory states that the universe as we know it started with an infinitely hot, infinitely dense _________ the size of a pencil point.

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