Science

Are 'mega-Earths' real? Stellar activity may explain these oversized rocky worlds

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Briefings

A new arXiv preprint from October 2026 proposes that 'mega-Earths' (rocky planets >10 Earths) are often misidentified due to stellar activity rather than true mass. The study suggests these oversized planets may be illusions created by magnetic activity on their host stars, challenging previous assumptions about their existence.

Key points

• A new arXiv preprint from October 2026 suggests 'mega-Earths' are often illusions created by stellar activity rather than true mass.
• The study proposes that magnetic activity on host stars could explain the apparent heaviness of these rocky planets.

Context

This research challenges existing planetary classification by suggesting stellar activity may mimic the characteristics of massive planets.

Limitations

The evidence is limited to a single arXiv preprint without peer review or observational confirmation. The specific stellar mechanisms and planetary masses remain unverified.

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