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Regarding cryogenic rocket engines, which is correct: do they use liquid oxygen and liquid hydrogen at very low temperatures, and is this technology needed for heavier communication satellites in geosynchronous transfer?

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1. Regarding cryogenic rocket engines, which is correct: do they use liquid oxygen and liquid hydrogen at very low temperatures, and is this technology needed for heavier communication satellites in geosynchronous transfer?

Only the first statement is genuinely incorrect

Both statements are genuinely incorrect

Only the second statement is genuinely incorrect

Neither statement is genuinely incorrect — both are genuinely true

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Regarding cryogenic rocket engines, which is correct: do they use liquid oxygen and liquid hydrogen at very low temperatures, and is this technology needed for heavier communication satellites in geosynchronous transfer?

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