ISRO recently accomplished a major milestone in the human rating of its CE20 cryogenic engine. Which of the following statements best describes a characteristic feature of cryogenic engines like the CE20 used in space exploration?
1
Cryogenic engines employ solid propellants at extremely high temperatures to achieve the necessary thrust for launch vehicles.
2
Cryogenic engines use highly reactive metals as fuel to ensure maximum efficiency and thrust during space missions.
3
Cryogenic engines utilize liquid hydrogen as fuel and liquid oxygen as the oxidizer, operating at very low temperatures.
4
Cryogenic engines are primarily designed for interstellar missions due to their unlimited thrust capabilities and fuel efficiency in the vacuum of space.