Expansion of the Universe Flashcards
1
Q
What does the expansion of the universe regard
A
Increase in distance between parts of the observable universe within time
2
Q
What is the key evidence for the expansion
A
Doppler effect
3
Q
What is the doppler effect also known as
A
cosmological red-shift
4
Q
What is the doppler effect
A
Objects moving away have light that is red
Objects coming towards have light that is blue
5
Q
Why does the doppler effect happen
A
waves get stretched as objects move away shifting towards red end of em spectrum
waves get shorter as objects move towards us so shift toward blue end of em spectrum
6
Q
When did the Big Bang happen
A
Accelerating expansion of the universe
7
Q
What was discovered about the expansion of the universe
A
it is accelerating so galaxies moving away at a faster rate
