It can be seen and weighed (it has a satellite) and visited (a probe went by).
Scientists can see Neptune with telescopes. Also, they have many photos of it from when the Voyager 2 passed by.
No, Neptune still exists.
No. There is no life on Neptune. Neptune is too cold to sustain any sort of life that is found on Earth and it does not have a solid surface. Grass only exists on Earth.
Linguistic Evidence
There is no evidence that Neptune has ANY inhabitants; let alone a king.
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Evidence that exists about saturated fats and why they are bad for you is that they cause clogged arteries and hear.
No credible evidence exists to date.
Techinically, Forever. But, we don't know that Neptune exists, so we can't say for sure.
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No. Neptune is a planet, while a constellation is a pattern of stars in the sky. The thing about constellations is that they do not really exist; Neptune is real and the stars are real, but the PATTERN of the stars exists only in our own minds.