Cosmic Optics

A World of Unyielding Density In the quiet reaches of the Vela constellation, approximately 31 light-years from our solar system, orbits a celestial body of extraordinary composition: GJ 367 b. Unlike the gas-dominated giants that populate much of the known exoplanetary catalog, this world is a testament to the extreme efficiency of planetary formation in close proximity to a red dwarf star. Classified as a sub-Earth, GJ 367 b possesses a radius roughly 72% that of Earth, yet it packs a density comparable to that of solid iron, suggesting an interior structure that is almost entirely metallic. Orbital Dynamics and Thermal Extremes The orbital mechanics of GJ 367 b are defined by an intense, rapid transit. Completing a full revolution around its host star in just 7.7 hours, the planet is subjected to constant, bl...

Located approximately 31 light-years from Earth in the southern constellation of Vela, the exoplanet GJ 367 b represents one of the most structurally dense rocky worlds ever confirmed by modern astronomy. Discovered in 2021 through data collected by NASA’s Transiting Exoplanet Survey Satellite (TESS) and subsequently characterized using ultra-precise radial-velocity measurements from the High Accuracy Radial Velocity Planet Searcher (HARPS) spectrograph , this world belongs to an extraordinary class of planets known as ultra-short period (USP) sub-Earths . Orbiting its host star in just 7.7 hours, GJ 367 b offers planetary scientists a rare laboratory for studying planetary structure under conditions of extreme stellar proximity. With a radius roughly 72 percent that of Earth and a mass equivalent to 63 percent of Earth's mass, GJ 367 b exhibits a calculated bulk density of approximately 10.2 grams per cubic centimeter. This density is signi...

Orbiting the red dwarf star GJ 367 in the constellation Vela, the exoplanet GJ 367 b represents one of the most extreme examples of planetary density discovered to date. Situated a mere 31 light-years from Earth, this sub-Earth-sized world is defined by its extraordinary composition, which suggests a massive, exposed metallic core left behind by the stripping of a primordial outer mantle. With an orbital period of just 7.7 hours, the planet is locked in a rapid, high-energy dance with its host star, enduring constant stellar flux that keeps its dayside surface at temperatures exceeding 1,500 degrees Celsius. The physical profile of GJ 367 b is dominated by its iron content. Astronomical data indicates that this planet possesses a density significantly higher than that of Earth. Models suggest that GJ 367 b is composed of approximately 85 percent iron by mass. This extr...

In the constellation Vela, approximately 31 light-years from Earth, orbits one of the most physically extreme terrestrial worlds discovered to date: Gliese 367 b (cataloged as GJ 367 b). Classified as an ultra-short period (USP) sub-Earth exoplanet, GJ 367 b completes a full revolution around its parent M-dwarf star in just 7.7 hours. This hyper-velocity orbit places the world mere 1.05 million kilometers from the stellar surface, exposing its bare, rocky surface to relentless bombardment from stellar radiation, severe tidal forces, and intense thermal energy. First detected by NASA’s Transiting Exoplanet Survey Satellite (TESS) and subsequently characterized through high-precision radial velocity measurements using the HARPS spectrograph, GJ 367 b presents an uncommon physical baseline. Despite having a radius only 70 percent that of Earth, its mass remains exceptionally high at roughly 55 percent of Earth's mass. This...