What is biggest rocket ever ?

On Ceres, where gravity is lower…I see huge rockets being assembled…
 
Any planet but Earth, really.

- Earth escape velocity: 11.2 km/s.
-Earth orbital velocity: 9300 m/s (with ascent losses).
...
-Lunar escape velocity: 2700 m/s.
-Mars orbital velocity: 4200 m/s.

-Chemical SSTO needs 0.95 propellant fraction to hit 9300 m/s.
-A mass fraction of 0.80 yields 6500 m/s (average).

So chemical SSTO ain't easy nor even feasible on Earth - but on Moon or Mars ? piece of cake, to orbital or escape velocities...
 

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