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Up to date: Aug 20, 2026 17:27 IST
Washington DC [US], August 20 (ANI): In a discovery that challenges present theories of planetary formation, astronomers have found an unusually dense, big exoplanet that boasts 23 instances the burden of Earth whereas remaining predominantly rocky. The 170-million-year-old planet is greater than 2.5 instances bigger than Earth!
The celestial physique, named GJ 523b, has been informally dubbed a “mega-Earth”- a uncommon class of exceptionally large, dense, rocky worlds.
In keeping with analysis led by Max Kroft on the University of Wisconsin-Madison, the exoplanet is roughly 2.5 instances wider than Earth (with a radius roughly 2.55 instances bigger), however packs a rare quantity of matter into its measurement, leading to a staggering density of about 126.82 grams per cubic inch.
GJ 523b was initially flagged by NASA’s Transiting Exoplanet Survey Satellite tv for pc (TESS) because it crossed in entrance of its host star. Researchers subsequently confirmed its existence and calculated its immense mass utilizing ground-based devices, together with the WIYN 3.5-meter Telescope at Kitt Peak Nationwide Observatory in Arizona.
In keeping with information, GJ 523b completes an orbit round its star each 17.75 days. The planetary system itself is comparatively younger, estimated at round 170 million years outdated.
The invention has left scientists puzzled. Conventional planetary formation fashions counsel that when a rocky core grows to roughly 20 instances the mass of Earth, its gravitational pull turns into robust sufficient to quickly attract large quantities of fuel from surrounding area, evolving right into a fuel big much like Jupiter or Saturn.
Nevertheless, regardless of crossing this mass threshold, GJ 523b retained an ultra-dense rocky composition with comparatively little environment.
“This is not what we anticipated in any respect,” stated Max Kroft, lead creator of the research, in a press assertion. “Dense planets like this aren’t unusual, however they’re normally small rocky planets much like Earth or Mercury. The query is, why did not this planet try this, if it is 20 instances the dimensions of Earth?”
Astronomers have proposed two main theories to elucidate the anomaly.
The primary, they are saying, might be ‘Atmospheric Stripping’. The planet could have initially shaped with a thick fuel envelope that was later blasted away by stellar exercise or cosmic occasions.
One other idea they’ve proposed is the ‘Large Impression’. The planet might have been created by a catastrophic collision between two massive rocky protoplanets, which merged their dense cores whereas blowing off their gentle gaseous layers.
The analysis paper detailing the invention has been submitted to The Astronomical Journal. Astronomers hope to determine extra such “mega-Earths” sooner or later to raised perceive whether or not GJ 523b is a solitary cosmic outlier or a part of a beforehand unrecognized class of exoplanets. (ANI)
