system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Why are space missions to moons of distant planets planned as flybys and not with rovers that could land on the surface of the moon and conduct better experiments ?
gpt
A flyby only requires acceleration to escape velocity from earth, then some more to send the craft on its way.  A lander or orbiter also requires massive fuel with the spacecraft to slow it down again as it approaches the target, and to match orbits with the target. It's not technically that much harder, it's just that the fuel weighs so much, and reduces experiments, sensors, and whatnot that they could take with them.