How do we know that galaxies farther away from us are moving faster than nearby galaxies?
Answers
Astronomers use the Doppler Shift to determine the speed at whih a source of light is moving. The faster the source moves, the greater the shift in the colour of the light we observe (compared to the colour of a stationary source).
Explanation:
Anyone who has listened to a train approaching and passing on a track has been aware of the change in sound pitch that occurs. This effect is known as the Doppler Shift, and is well understood for all types of waves, including sound and light.
ANSWER:
A galaxy moving with the expanding Universe will be even a greater number of light years away, today, than the number of years (multiplied by the speed of light) that it took the light emitted from it to reach us. ... On average, the farther away a galaxy is from you, the faster it will appear to recede away from you.
HOPE IT HELPS
PLZ MARK ME AS A BRAIN LIST AND THANK ME PLZ