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It is not possible to answer this question for two reasons. The first is that the distance from the earth to Neptune ranges from 4.35 billion to 4.65 billion km - depending on whether the two are on the same or opposite sides of the sun. Still, that is not too different from the average of 4.50 billion kilometres. It is near enough impossible to launch a space rpcket which would travel at a constant speed of 40323 km an hour. Space travel is not undertaken in a straight line. Rocket ships usually swing by the moon, or other planets, and use a kind of gravitational slingshot action to gain acceleration.

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7y ago

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