Question

what is used to prevent freezing of fuel in space craft

Answer 1

There are two types of fuel

1.Cryogenics: they only need to prevent heating because they are only liquid hydrogen and oxygen

2. Fuel and oxidicer are susceptible of freezing so that the spacecraft is kept rotating so it heats uniformily....

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Answer 2

There are two types of fuel:  

-Cryogenics: they only need to prevent heating because they are liquid hydrogen and liquid oxygen (used by ESA).

-Fuel and oxidiser are susceptible of freezing so the spacecraft is kept rotating so it heats uniformly (used by early NASA and SpaceX).