The thing about Neptune being 400 light years away isn't true. It is (250 light minutes). Light reflected on Neptune would take a little over 4 hours to reach Earth. The way you are saying it would mean that it would take a space craft 400 years to reach Neptune if it was traveling at the speed of light. Our solar system isn't that big.
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Thank you sir for spotting that! You're completely right. Changes have been made