K2-21 b is an intriguing exoplanet orbiting the star K2-21, discovered back in 2015 thanks to the watchful eyes of the Kepler Space Telescope’s CCD array. This planet was spotted using the transit method, where it briefly dims its star’s light as it passes by—like a cosmic wink from across the galaxy. While it doesn’t have a fancy formal name, K2-21 b still captures the imagination of space explorers due to its mysterious nature and its place in the K2 mission’s expansive survey of distant worlds. Although it’s far beyond our solar system, K2-21 b reminds us how vast and diverse the universe is, full of planets waiting to share their secrets with curious minds.
