Interplanetary only need to have 2nd cosmic speed (just slightly about 11km/s), but interstellar must be 3rd cosmic speed, (at Earth much faster than 42km/s).

Interplanetary only need to have 2nd cosmic speed (just slightly about 11km/s), but interstellar must be 3rd cosmic speed, (at Earth much faster than 42km/s). https://en.wikipedia.org/wiki/Escape_velocity#List_of_escape_velocities https://en.wikipedia.org/wiki/Escape_velocity#List_of_escape... BTW interesting, that on some places in Sun system, difference of 2nd and 3rd speeds is much less.