Question

What effect is used to determine the speed of distant stars?

the Einstein effect
the Doppler effect
the Hubble effect
the Galaxy effect

Answer 1

doppler effect

Step-by-step explanation:

''The Doppler effect occurs for light as well as sound. For instance, astronomers routinely determine how fast stars and galaxies are moving away from us by measuring the extent to which their light is “stretched” into the lower frequency, red part of the spectrum''