How much of the solar system's mass is in the Sun?
The Sun contains about 99.8% of all the mass in our solar system.
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- Has any spacecraft visited Neptune?
“Only one spacecraft, Voyager 2, has visited Neptune, in 1989.”
Reference: NASA
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How was Neptune discovered?
Neptune was discovered in 1846 after mathematicians predicted its location from its gravitational pull on Uranus.
Has any spacecraft visited Uranus?
Only one spacecraft, Voyager 2, has visited Uranus, in 1986.