Question

What is the redshift?

It's for astronomy.

Answer 1

Explanation:

Subtle changes in the color of starlight let astronomers find planets, measure the speeds of galaxies, and track the expansion of the universe. Astronomers use redshifts to track the rotation of our galaxy, tease out the subtle tug of a distant planet on its parent star, and measure the expansion rate of the universe

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Answer 2

Answer:

'Red shift' is a key concept for astronomers. The term can be understood literally - the wavelength of the light is stretched, so the light is seen as 'shifted' towards the red part of the spectrum. Something similar happens to sound waves when a source of sound moves relative to an observer.