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Mystery "Mega-Planet" 23 Times More Massive than Earth Baffles Scientists

Researchers say GJ 523b is about 23 times Earth’s mass and may have lost most of its gas despite expectations for a thick atmosphere.

Summary by Newsweek
“This isn’t what we expected at all,” researchers said of a Mega-Earth that defies planet formation theories.

4 Articles

Some 86.8 light-years from Earth, in the direction of the constellation of Hunting Dogs, there is a planet that does not fit too well with what scientists expected to find. GJ 523b (also known as TOI-7032b) was baptized and revolves around a type K orange dwarf star called GJ 523. Although its radius is only 2.55 times greater than the terrestrial one, it possesses no less than 23.5 times the mass of the Earth. As a result, it reaches an estimat…

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The discovery is a fascinating enigma for modern astrophysics and forces experts to reconsider the mechanisms that determine the birth of such large celestial bodies.

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gazzetta.gr broke the news on Thursday, August 20, 2026.
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