Front

Cosmic Background Radiation (CBR)

Back

The leftover energy from the Big Bang.

Front

What does it mean that the universe is expanding?

Back

The amount of space between galaxies is increasing.

Front

What are two important pieces of evidence for the Big Bang?

Back

Doppler Effect (the redshifting of the Universe) and cosmic background radiation.

Front

What is definitely present in space after an explosion?

Back

Light.

Front

What does redshift indicate about a galaxy?

Back

It is moving AWAY from us.

Front

What is the Doppler Effect?

Back

The change in frequency or wavelength of light from an object moving away or towards an observer.

Front

What is the significance of cosmic background radiation?

Back

It provides evidence for the Big Bang theory and the early state of the universe.

Front

What is the primary composition of the universe?

Back

Hydrogen, helium, and lithium.

Front

What happens to light as galaxies move away from us?

Back

It shifts to longer wavelengths, appearing redder (redshift).

Front

What is the relationship between redshift and the distance of galaxies?

Back

Greater redshift generally indicates that a galaxy is farther away.