GJ 3138 d is an exoplanet orbiting the red dwarf star GJ 3138, discovered in 2017 using the trusty HARPS Spectrograph at the La Silla Observatory. This distant world was spotted not by looking directly but by noticing the tiny wobbles in its star's light, thanks to the radial velocity technique. While we don’t have a flashy name for it yet, GJ 3138 d is a fascinating addition to the ever-growing family of exoplanets orbiting cool, faint stars in our galaxy. With its quiet star shining far away, this planet invites curious minds to wonder what its skies might look like and whether it hosts any secrets beneath its alien atmosphere.
