Big Bang Theory
What does the Big Bang theory explain?
The origin of the universe.
What is redshift?
When light and sound wavelengths get longer.
What two elements were made right after the Big Bang.
Hydrogen and Helium
About how many years ago did the Big Bang happen?
13.7 billion years ago.
Why do galaxies look redshifted.
Because they are moving father away from us.
What is the most common element in the universe?
Hydrogen
What happened right after the Big Bang?
The universe started expanding and cooling.
What does redshift tell us about the universe.
its still expanding.
What present of the universe is Hydrogen.
About 75%
What evidence supports the Big Bang theory?
Redshift and CMB.
what kind of shift happens when something is moving closer to us.
Blueshift
What present of the universe is Helium.
About 25%
What is still happening to the universe today?
It is still expanding.
Who discovered galaxies are redshifted.
Eddie Hubble