Spacecraft provided with low and high thrust propulsion system

A spacecraft comprising:

• at least one water reservoir containing liquid water, a first thrust propulsion part and a second thrust propulsion part, wherein:
• the first thrust propulsion part provides at least five times the thrust of the second propulsion part;
• the first thrust propulsion part comprises at least one first thruster each comprising:
• a regulating valve that receives the liquid water from the at least one water reservoir a water splitting device that splits the liquid water into gaseous hydrogen and gaseous oxygen;
• a combustion chamber in which the gaseous hydrogen reacts with the gaseous oxygen;
• and an exhaust nozzle coupled to an output of the combustion chamber;
• and
• the second thrust propulsion part comprises:
• a liquid water supply line that receives liquid water from the at least one water reservoir;
• and
• a plurality of branches, each coupled to the liquid water supply line and each comprising:
• a regulating valve that receives the liquid water from the liquid water supply line;
• a vaporization chamber downstream of the regulating valve;
• and
• an expansion nozzle downstream of the vaporization chamber.