Question

What is red shift and blue shift?

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Answer 1

Explanation:

Redshift and blueshift describe how light shifts toward shorter or longer wavelengths as objects in space (such as stars or galaxies) move closer or farther away from us. ... When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer.

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Answer 2

Explanation:

ᴀ ʀᴇᴅ sʜɪʀᴛ ʏᴇᴀʀ ɪs ᴀ ʏᴇᴀʀ ɪɴ ᴡʜɪᴄʜ ᴀ ᴘʟᴀʏᴇʀ ɪs ᴏɴ sᴄʜᴏʟᴀʀsʜɪᴘ ᴀɴᴅ ᴄᴀɴ ᴘʀᴀᴄᴛɪᴄᴇ,ʙᴜᴛ ᴅᴏᴇs ɴᴏᴛ ᴘʟᴀʏ,ɪɴ ᴇxᴄʜᴀɴɢᴇ ғᴏʀ ᴀɴ ᴇxᴛʀᴀ ʏᴇᴀʀ ᴏғ ᴇʟɪɢɪʙɪʟɪᴛʏ