When Neptune and Earth line up on the same side of the sun, at their closest, they are only 2.7 billion miles (4.3 billon kilometers) apart. But when the planets are on opposite sides of the sun.. Space Travel Calculator. Calculate how long it would take to reach planets, stars, or galaxies, as well as fuel mass, velocity and more! Planets Solar System Objects Questions Kids Buyer's Guides. Select Your Destination. Choose Universe Model. Acceleration. Spaceship Mass. Distance.
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When you convert that to time, you end up with a very, very long space trip. NASA's space probe Voyager 2 left Earth in 1977 in an effort to reach the far-away planets and gather information.Twelve years later, in 1989, Voyager 2 flew close enough to Neptune to take some breathtaking photos of the blue planet.. 1612: Galileo incorrectly records Neptune as a fixed star during observations with his small telescope. 1846: Using mathematical calculations, astronomers discover Neptune, increasing the number of known planets to eight. Neptune's largest moon, Triton, is found the same year. 1983: Pioneer 10 crosses the orbit of Neptune and becomes the first human-made object to travel beyond the orbits of.
