Spacecraft can use the gravity of planets to assist them in gaining incredible speeds, speeds which would otherwise be impossible as more speed requires more fuel, which adds more weight and therefore requires more fuel. Using planets to add additional speed is referred to as "gravitational assist" or more commonly, "slingshot". When a comet turns from a solid to a gas immediately, which is caused when ice heats up in a vacuum such as in space, it doesn't melt, it expolodes in a process referred...
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