Question

Why do scientists observe blueshift in certain stars?

a) "Because they are moving away from Earth"
b) "Due to their proximity to black holes"
c) "Because they are emitting blue light"
d) "Due to their movement toward Earth"

Answer 1

Scientists observe blueshift in certain stars because they are moving toward Earth. When a star is moving towards us, its light waves get compressed, causing a shift towards the blue end of the spectrum.

Step-by-step explanation:

Scientists observe blueshift in certain stars because they are moving toward Earth. When a star is moving towards us, its light waves get compressed, causing a shift towards the blue end of the spectrum. This phenomenon is known as blueshift.