Question

Which of these is the best method to estimate the speed at which a star is moving away from Earth? (3 points)

a
measure the star's red shift

b
measure the star's blue shift

c
calculate the parallax due to changes in Earth's position

d
calculate the pitch due to changes in frequency of light

Answer 1

@tetsxpreme

Answer 2

@Tranquility

Answer 3

Well do you know what each star is?

Answer 4

no

Answer 5

Which one do you think it is?

Answer 6

c or d

Answer 7

earth to @tetsxpreme

Answer 8

The term "blueshift" refers to the shift in wavelengths of light toward the blue end of the spectrum as an object moves toward us in space. Astronomers use blueshift to understand motions of galaxies toward each other and toward our region of space.
https://www.thoughtco.com/blue-shift-definition-3072288#:~:text=The%20term%20%22blueshift%22%20refers%20to,toward%20our%20region%20of%20space.