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420 on Earth · 159 on Mars
420 → 159
NASA Mars/Earth surface-gravity ratio 0.379. 420 × 0.379 = 159.18. Mars is 38%. Not 42.
The same 420, a third field. NASA’s Mars fact sheet prints 3.71 m/s² against Earth’s 9.80. The ratio is 0.379. Four hundred twenty times that is 159. The Moon gave 69. Mars gives 159. Thirty-eight percent of Earth is not forty-two. Close. Not a 42. The body did not change. Anyway.
What it supports
NSSDC Mars Fact Sheet, surface gravity 3.71 / 9.80 = 0.379. Same operation as the Moon card. Different world.
What it does not
Not 42. Not 69. Not 142 sols. Not a landing clock.
Calculation
420 × 0.379 = 159.18. g_Mars 3.71 m/s², g_Earth 9.80 m/s². 38% ≠ 42%.
W = mg. NASA Mars/Earth table as printed. 38% is not 42.
ExactnessDerived mathematics
Form420
Unitlbf
Strengthreproducible
Hung9 September 2026