Story thread · 2 reports / 2 sources
Astronomers discover a giant, rocky 'mega-Earth' 23 times more massive than our planet
space.com · 2h
"This isn't what we expected at all."
First report: Mega-Earth GJ 523b is 23 times as massive as our planet—but only 2.5 times as wide — phys.org, 1d
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