Fuel is so useful to spacecrafts because without the fuel the spacecraft would not go.
so they can go out on mars and other planets
They supply power to the spacecraft during missions.
because it is to do with other planets but mostly mars and galexy if we had the tehcnical difficultys in the balance of time, timeloards from Doctor Who would come back to life if we belived.
because hydrogen is in the fuel cell. hydrogen is useful in many things including spacecrafts. please do not use this for anything important because I'm not sure but i been reading this page about hydrogen and it is true. I know for sure that hydrogen is used for rocket fuel because it is on the sheet. By Georgina thank you 4 going on wikianswers.com
The heavier it is the stronger the engine has to be. And the stronger the engine the more fuel will it burn. And the more fuel it burns the more fuel has to be carried in the rocket. And the more fuel the rocket has to lift the stronger the engine has to be. While some Spacecrafts are not light weight such as the Apollo 11 But is the Largest And Fastest That Got to the moon
Without fuel, the spacecraft cannot launch.
because they are used to provide water and electricity for the spaceship... so very useful....
The fuel used by the Apollo 15 spacecraft as well as all the Apollo spacecrafts , was a mixture of oxygen and nitrogen gases.
The three kinds of rockets are solid fuel rockets, liquid fuel rockets, and ion powered rockets.
They supply power to the spacecraft during missions.
Saturn is a gas planet, so it has no surface
Although several spacecrafts have been sent to Venus, no alien spacecrafts have been discovered on its surface.