Here is what the page “Are 'mega-Earths' real? Stellar activity may explain these oversized rocky worlds” contains. Some of the heaviest rocky planets ever reported might not be as massive as they appear. 8 suggests that so-called 'mega-Earths' — rocky worlds weighing more than about 10 Earth masses — could be an illusion caused by activity on their host stars. If confirmed, this would challenge the existence of a class of planets that has puzzled astronomers since the first discoveries.
The research highlights how stellar noise, such as starspots or pulsations, can mimic the gravitational wobble of a massive planet, leading to overestimated masses. By reanalyzing data for several candidate mega-Earths, the team found that accounting for stellar activity often reduces the inferred masses below the 10-Earth threshold, bringing them in line with ordinary super-Earths. This matters because mega-Earths, if real, would require extreme formation conditions and offer insights into planetary diversity. For the complete material, the listing points back to the source inside the network.