Radial velocities use a well-known effect to detect exoplanets--and they opened up a whole new window onto the galaxy for us!

Find me: https://linktr.ee/ngttg

51 Peg b discovery, Michel & Queloz 1995: https://ui.adsabs.harvard.edu/abs/199...

Thumbnail Photo Credits: Ethan Tweedie Photography/W. M. Keck Observatory