which provides an extra level of safety and mission abort capability.

Use of liquid propellants can also be associated with a number of issues:

* Because the propellant is a very large proportion of the mass of the vehicle, the center of mass shifts significantly rearward as the propellant is used; one will typically lose control of the vehicle if its center mass gets too close to the center of drag/pressure.
* When operated within an atmosphere, pressurization of

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