description Gliese 581 b Overview
Gliese 581 b is a hot Neptune-mass planet and the first discovered in the Gliese 581 system, detected by the HARPS spectrograph in 2005 around an M-dwarf ~20 light-years away.
insights Why this score
Gliese 581 b ranks #123 of 269 in the Exoplanet ranking, behind Kepler-11g, ahead of Kepler-90g.
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How good is Gliese 581 b?
Gliese 581 b scores 6.62/10 (Fair) on Lunoo, making it rated in the Exoplanet category.
What are the best alternatives to Gliese 581 b?
See our alternatives page for Gliese 581 b for a ranked list with scores. Top alternatives include: Mu Arae c, YZ Ceti b, Wolf 1061 b.
How does Gliese 581 b compare to Mu Arae c?
See our detailed comparison of Gliese 581 b vs Mu Arae c with scores, features, and an AI-powered verdict.
Is Gliese 581 b worth it in 2026?
With a score of 6.62/10, Gliese 581 b is a solid option in Exoplanet. See all Exoplanet ranked.
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