Astronomers Discover Rare ‘Mega-Earth’ Exoplanet: Gliese 523b
Astronomers have identified a rare 'Mega-Earth' exoplanet named Gliese 523b, which is significantly denser than Earth despite its large size. The discovery, made using data from the WIYN Telescope and NASA's TESS mission, highlights the need for interdisciplinary collaboration between astronomers and geologists.
Why it matters
This discovery provides a concrete benchmark for defining 'Mega-Earths' and challenges existing models of planetary formation and composition.
Gliese 523b (GJ 523b) is a young, ultra-dense planet that orbits almost perpendicular to its star’s spin, according to a team of U.S. astronomers.
An artist’s impression of a giant exoplanet. Image credit: Sci.News.
“People have been using the phrase ‘ mega-Earth ’ for more than a decade, but we’ve never had a planet that let us say concretely what one is,” said Dr. Thomas Beatty, an astronomer at the University of Wisconsin-Madison .
“Gliese 523b finally does. What is also striking is that nailing down the definition of a mega-Earth isn’t something us astronomers can really do by ourselves.”
“We need geologists who understand how iron and rock behave at pressures no laboratory on Earth can reach, and atmospheric scientists who can tell us how much of what we measured is rock at all.”
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