The Superheated Rocky Interior of Exoplanet Gliese 876 d
Gliese 876 d represents one of the most intriguing examples of a terrestrial-mass world orbiting in extreme proximity to its host star. Located approximately 15 light-years away in the constellation Aquarius, this exoplanet challenges our understanding of planetary formation and survival. With a mass roughly 6.8 times that of Earth, it occupies a classification often referred to as a Super-Earth , yet its environment is defined by gravitational and thermal extremes that fundamentally alter its surface geology and atmospheric dynamics. The orbital period of Gliese 876 d is an incredibly brief 1.9 days. Because it resides so close to its M-dwarf star , the planet is subjected to immense tidal forces . These forces act to synchronize the rotation of the body with its orbit, resulting in a state of tidal locking . One hemisphere is bathed in perpetual, blinding starl...