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Chasethe ship vs the wall
Curvethe energy chart
Speed presets
Parker probe191 km/s · fastest craft
0.1 c0.5% of a rest-mass
0.5 c0.15 mc²
0.9 c1.29 mc²
0.99 c6 mc²
0.999 c21 mc²
LHC protonγ ≈ 7,250 · still not c
Warp bubblethe wall does not apply
T1 · Special relativity
For a mass of
1 kg
1 tonne
1,000 t ship
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Equal-energy steps (Curve)
Readout · live
Speed β
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Lorentz γ
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Kinetic energy
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In joules
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Rapidity φ
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Next 0.001 c
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Ship clock (1 g)
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World energy / yr
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Why speeds refuse to add
Fire a 0.9 c probe from a 0.9 c ship and a bystander measures not 1.8 c but 0.994 c : velocities combine as (u + v)/(1 + uv/c²) , which can never cross c. What does add cleanly is rapidity , φ = artanh β. You can always add more φ, but β = tanh φ stays below 1 for any finite value. The same wall, seen from a second angle.
What is exact vs stylised
Exact: KE = (γ−1)mc², γ, rapidity, the 1 g relativistic-rocket run β = tanh(aτ/c), the Parker / LHC anchors, and every printed number. Stylised: the wall's on-screen distance (a power of 1−β so it visibly crowds and never arrives), the sped-up ship clock, the linear axis cap at 8 mc², and the warp bubble sweep, which is the one T2 element.
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