1.2 The Big Bang

The Big Bang Theory is an explanation for...

• How gravity works

• How the universe was formed

• How our solar system formed

• How light works

Scientists estimate the Big Bang happened...

• 14 million years ago

• 1 billion years ago

• 14 billion years ago

• 40 billion years ago

Three seconds after the Big Bang, there were stars in the universe.

• True

• False

Which is the correct order of events?

• Big Bang --> Stars --> Atoms

• Atoms --> Big Bang --> Stars

• Stars --> Big Bang --> Atoms

• Big Bang --> Atoms --> Stars

The first elements created after the Big Bang were...

• Hydrogen and Helium

• Hydrogen and Oxygen

• Helium and Oxygen

• Oxygen and Nitrogen

Which of these things existed before the Big Bang?

• Light

• Time

• Nothing

• Space

Which words describe the universe when it was less than one second old?

• Small, cold

• Large, cold

• Small, hot

• Large, hot

Groups of stars joined together to become...

• Stars

• Galaxies

• Planets

• A new Big Bang

It took ___ minutes for the first atoms to form.

• 1

• 2

• 3

• 4

A theory is...

• A well-tested explanation

• The best explanation for a natural event

• Tested and supported with evidence

• All of the answers are true