Which exoplanet has the strongest surface gravity?
Among rocky worlds with a physically consistent measured mass and size, Kepler-123 b has the strongest surface gravity known: 6.4 times Earth's. Everything about Kepler-123 b →
| # | World | Surface gravity | Distance |
|---|---|---|---|
| ★ 1 | Kepler-123 b | 6.4x Earth gravity | 3,332 ly |
| 2 | Kepler-287 c | 6.2x Earth gravity | 2,726 ly |
| 3 | TOI-1853 b | 6.1x Earth gravity | 538 ly |
| 4 | Kepler-462 b | 6.0x Earth gravity | 1,946 ly |
| 5 | Kepler-297 b | 5.9x Earth gravity | 2,257 ly |
| 6 | Kepler-282 e | 5.8x Earth gravity | 4,363 ly |
| 7 | Kepler-277 c | 5.7x Earth gravity | 3,185 ly |
| 8 | TOI-332 b | 5.6x Earth gravity | 727 ly |
| 9 | Kepler-32 d | 5.5x Earth gravity | 1,056 ly |
| 10 | Kepler-145 b | 5.3x Earth gravity | 1,849 ly |
Gravity is computed from mass and size, and this record only admits worlds where those two numbers are physically consistent: together they must imply a density in the rock-to-iron range. That gate matters because the raw table is full of minimum masses sitting on tiny radii, implying impossible densities and gravities that were never real. Where a mass is a minimum (the m·sin i method), the gravity is a floor and reads "at least".
For comparison, Mars pulls at 0.38 g and our Moon at 0.17 g. What could unseat this record: a newly weighed super-Earth whose measured mass and radius both check out; mass measurements improve every year.
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