Activity 3. Big bang

BIG BANG

Most astronomers believe the Universe began in a Big Bang about 14 billion years ago. At that time, the Universe was inside a very small bubble. It was very hot and dense. Then it exploded. The time, space and matter  all began with the Big Bang.

The universe went from very small to larger than a galaxy. And it kept growing. It is still expanding today.

As the Universe expanded and cooled, energy changed into particles of matter and antimatter. These two opposite types of particles destroyed each other.

But some matter survived. More stable particles called protons and neutrons started to form when the Universe was one second old.

The next three minutes, the temperature dropped below 1 billion degrees Celsius.

Now protons and neutrons can join forming hydrogen and helium nuclei

Activity 2. Astronomer's timeline

Activiy 1. Famous Astronomers

Edwin Hubble	November 20, 1889	He thought of big bang theory
Johannes Kepler	December 27, 1571	He proposed that the planets revolve around the Sun in elliptical or non-circular orbits
William Herschel	November 15, 1738	He discovered the planet uranus .
Nicolaus Copernicus	February 19, 1473	His theory was that the sun was in the center of the universe and the earth was rotating on itself
Albert Einstein	March 14, 1879	He created the theory of the relativity.