Heating system for a spacecraft

A spacecraft, comprising:

• a compartment defined within the spacecraft;
• a component disposed within the compartment, wherein the component is selected from avionics;
• a fuel source comprising a fuel;
• a rocket engine in fluid communication with the fuel source, wherein the rocket engine is configured to decompose the fuel and generate a propulsive exhaust gas to propel the spacecraft;
• and
• a heating system, comprising:
• a gas generator in fluid communication with the fuel source, the gas generator comprising a catalyst, wherein the catalyst is configured to decompose the fuel and generate an exhaust gas;
• and
• a heat sink thermally coupled to the gas generator and configured to receive heat from the exhaust gas of the gas generator, wherein the heat sink is thermally coupled to the component within the compartment of the spacecraft to transfer heat from the exhaust gas to the component;
• and
• a tubing indirectly coupled to the component and configured to direct heat from the exhaust gas to the component.