1. Group questions What is the Big Bang?
Where have all the atoms come from?
How big is the universe?

2. The Universe Started 13.7 billion years ago (?) with the Big Bang!
First there was time and space
Then hydrogen (H) and helium (He)
H and He cooked in stars for billions of years to make all other elements
The observable universe contains about 100 billion galaxies
Our galaxy “the Milky way” contains about 400 billion stars
Our Sun is a smaller than average star, about 5 billion years old
Our solar system consists of
1 star
8 planets and their moons
5 dwarf planets
comets, asteroids, space dust…