The Origin of the Universe

Question 1

What does the universe seem to be doing

Answer 1

Expanding `

Question 2

Why do we think the universe is expanding

Answer 2

Galaxies seem to be moving away from each other

Question 3

What is the evidence for the galaxies moving apart

Answer 3

Redshift

Doppler effect

Question 4

Explain redshift

Answer 4

Different chemicals absorb different frequencies of light
Each element produces a specific pattern of dark lines at the frequencies that it absorbs in the visible spectrum
When we look at light from distant galaxies we can see the same patterns but at slightly lower frequencies than they should be - they’re shifter towards the end of the red end of the spectrum.
Red Shift

Question 5

Explain the Doppler effect

Answer 5

The sound waves from a car are equally spaced but for a moving car, the wavelengths seem longer on the side they face an individual that the side facing away from the individual
The frequency of the sound waves seems to be lower if the car is moving away from you

Question 6

The further away a galaxy is the … the red-shift

Answer 6

Greater

Question 7

What do measurements of the red shift suggest

Answer 7

That all the galaxies are moving away from us very quickly

Question 8

Do more distant galaxies have a greater or lower red-shift

Answer 8

Greater