Definition

A change in the wavelength of light where the wavelength becomes longer than it was when it was emitted, often observed in celestial bodies moving away from the observer.

Example

Astronomers use redshift to determine how fast galaxies are moving away from us.

Conversation

Have you heard about the concept of redshift in astronomy?

Yeah, I think it’s related to how light changes as it travels through space.

Exactly! It helps us understand how far away galaxies are.

That’s pretty fascinating; it’s amazing what we can learn from light!

Synonyms & Antonyms

Root Explanation

Redshift is formed from "red" (from Old English "read", meaning the color red) and "shift" (from Old English "scyftan", meaning to cause to move or change). The term "redshift" refers to the phenomenon where light from an object is shifted towards the red end of the spectrum, indicating that the object is moving away from the observer.

Memory Tip

Think of the color 'red' indicating a shift or change in light towards the red spectrum, which helps you remember that 'redshift' describes light moving away.

Visually Confused Words