KnowraHD 209458 bLinked fromLinked fromThe 8 pages that link to HD 209458 b, each with the reason it gives.All 8Broader topic 5Related 1Compared with 2Hot JupiterBroader topic: Its transit enabled early direct measurements of an exoplanetary atmosphere.Exoplanet atmosphereBroader topic: Transit observations of this planet enabled early detections of atmospheric sodium and escaping hydrogen.Planetary transitBroader topic: Its observed transits enabled direct measurement of an exoplanet’s radius.Exoplanet detectionBroader topic: Its transit made a planet’s radius measurable and opened a new observational route.Giant planetBroader topic: Its observed atmospheric escape made giant-planet atmospheres measurable beyond the Solar System.