Using data from NASA’s Transiting Exoplanet Survey Satellite (TESS) and several ground-based facilities, astronomers have discovered a long-period sub-Neptune exoplanet orbiting TOI-2257. Intriguingly, the planet’s orbit is highly elliptical, suggestive of a possible perturbing outer gas-giant planet in the TOI-2257 system. An artist’s impression of a gas-giant exoplanet and its parent red dwarf star. Image credit: Sci-News.com. “Despite their...
