The universe includes all space and everything in it—every bit of matter and energy that exists. Within the universe are galaxies, which are massive collections of billions of stars, along with dust and gas, all held together by gravity.
Our galaxy contains our solar system, which includes the Sun and all the planets and other objects that orbit around it.
A planet is a large, round object that travels around a star in an elliptical orbit. Earth is a planet that orbits the Sun. The Big Bang Theory, which states that all matter and energy in the universe were once compressed into an extremely small point called a singularity.
This singularity expanded rapidly, beginning the formation of the universe as we know it today.
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