Gravity assist is a great way to save money on spacecraft fuel. Which of the following is one reason NASA might NOT be able to use it to send a spacecraft to Neptune?
W) The planets are rarely lined up in the right places
X) Gravity assist only works for small planets
Y) The gravity of gas giant planets is difficult to predict
Z) Neptune's orbit crossing with Pluto creates a chaotic system
✔️Answer:W) THE PLANETS ARE RARELY LINED UP IN THE RIGHT PLACES
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