Which exoplanet has the strongest surface gravity?
Among worlds small enough to have a surface, with a mass and size that agree, 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 |
| 11 | Kepler-338 b | 5.1x Earth gravity | 1,803 ly |
| 12 | TOI-1696 b | 5.1x Earth gravity | 212 ly |
| 13 | TOI-1174 b | 4.9x Earth gravity | 309 ly |
| 14 | Kepler-58 b | 4.6x Earth gravity | 3,161 ly |
| 15 | Kepler-411 b | 4.4x Earth gravity | 501 ly |
| 16 | Kepler-215 d | 4.1x Earth gravity | 1,585 ly |
| 17 | Kepler-122 e | 4.1x Earth gravity | 3,351 ly |
| 18 | Kepler-189 c | 4.0x Earth gravity | 1,929 ly |
| 19 | WASP-84 c | 4.0x Earth gravity | 328 ly |
| 20 | HD 22946 d | 3.9x Earth gravity | 205 ly |
| 21 | Kepler-279 d | 3.9x Earth gravity | 3,384 ly |
| 22 | Kepler-62 d | 3.7x Earth gravity | 981 ly |
| 23 | Kepler-84 c | 3.6x Earth gravity | 3,340 ly |
| 24 | KOI-94 b | 3.6x Earth gravity | 1,556 ly |
| 25 | Kepler-53 c | 3.6x Earth gravity | 4,456 ly |
Showing the top 25 of 1,951 that qualify.
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.
Which exoplanet has the strongest surface gravity?
Among worlds small enough to have a surface, with a mass and size that agree, Kepler-123 b has the strongest surface gravity known: 6.4 times Earth's.
Where would you weigh the most?
On Kepler-123 b, among the worlds with solid ground and a mass and size that agree with each other. Its surface gravity is 6.4x Earth gravity, so a person weighing 150 pounds on Earth would weigh a good deal more there and would find walking genuinely hard work.
Why are gas giants not at the top of this list?
Because there is nowhere to stand on one. A giant's quoted surface gravity is measured at the top of its clouds, an arbitrary altitude in an atmosphere thousands of kilometres deep, so it is not a surface gravity in any sense you could experience.
How is surface gravity calculated?
From mass and radius alone: gravity scales with mass and falls off with the square of the radius. That makes it only as reliable as those two numbers, which is why this ranking requires a mass and a radius that together imply a physically possible density.
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