Big Bang Review

What were Edwin Hubble’s three big contributions to the big bang theory

redshift-distance relationship, the classification of galaxies, and the observation that galaxies are moving away from each other

What units are used to measure electromagnetic waves

nanometers

How is the electromagnetic spectrum used to confirm the expansion of the universe?

By analyzing the redshifts of light from distant galaxies, scientists can determine that these galaxies are moving away, indicating an expanding universe.

What does cosmic microwave background radiation represent?

It represents the afterglow of the Big Bang, providing evidence of the universe's early hot and dense state.

How many years after the universe began to expand was CMBR released?

400,000 years

What are the three most common elements in the universe?

Hydrogen, Helium, Oxygen

What percent of elements in the universe are hydrogen?

75%

What percent of elements in the universe are helium?

25%

What percent of elements in the universe are oxygen?

1%

Why did the formation of elements stop after the first 2 or 3 were made?

The universe cooled too quickly and expanded