The Big Bang theory was first suggested by a cosmologist and priest named Georges Lemaître in the 1920s. He believes that the universe began as a single atom at the beginning of time. Rather than an explosion, the universe simply began to expand in a fraction of a second thanks to matter and energy. Over time, the expansion slowed, but Lemaître and many other scientists believe the universe is still expanding today.
The force of gravity plays a huge role in everything about the universe. All objects in space are formed when particles and gases from the expansion of the universe come together (by gravity). When small amounts of dust and gas gather together, planets form and begin to orbit the star. Another force called dark energy or dark matter is also important. We don't have much information about this, but scientists think it's what's causing the cosmos to separate more and more quickly.
We hope you and your students enjoyed learning about this awesome idea! If you want to learn even more, head over to our website and download one of our many free universe lesson plans, filled with activities, worksheets, and more!
https://learnbright.org/lessons/science/big-bang-theory/
What you'll learn in The Big Bang Theory for Kids:
0h00 Introduction to the big bang theory
0:48 Georges Lemaître, cosmologist and priest
1:30 What the Big Bang theory suggests
2:49 The formation of our solar system
3:32 Scientists and the Hubble Space Telescope
16:39 Review of the facts
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