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The Big Bang

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by

Soraya Yasin

on 17 April 2013

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Transcript of The Big Bang

The Big How it started Astronomers roughly believe the Big Bang
started 14 billion years ago. It started with a bubble that was thousands of times smaller
than a pinhead. It was hotter and denser
than anything we could imagine. The bubble
then exploded. The universe was smaller than an atom then grew larger than the galaxy. By Soraya Yasin 1 Second Old As the universe expanded and cooled, energy changed into matter and antimatter. These two
objects both destroyed each other but some matter still survived. More secure particles called protons and neutrons came together to form the Universe when it was just 1 second old! 3 Minutes Old After the next 3 minutes the Universe cooled down by one billion degrees Celsius. The protons and neutrons could start to come together forming hydrogen and helium nuclei. Who proposed the Big Bang? The Big Bang was first proposed in 1931 by Georges Lemaitre from Belgium. He was a professor at the Catholic University of Louvain. He graduated from Cambridge University in 1923 and he got his PhD from MIT in 1927. Georges
Lemaitre Early Life Studying ancient rocks have showed that life began on Earth about 3,800 million years ago. Though, at that time the Earth wasn't a nice place to live. The air was dense and poisonous. Comets and meteorites kept crashing into the planet. Scientists believe that maybe the Earth started with lakes and oceans. Overtime simple chemicals joined up with other chemicals which became more complex. One day a molecule started to make many copies of itself. That's when Earth sprung with life. The Big Bang Catholic University of Louvain Protons and
neutrons Thank you for watching!
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