Astronomers were actually studying another planet, Uranus.
it is found on the planet neptune
The planet Neptune.
Neptune
The 8th planet : Neptune.
Eris is found past Neptune along with Pluto
Neptune was confirmed as a planet close to its discovery in September 23, 1846. Mathematicians knew there was another planet there somewhere, it was found by mathematical prediction.
Neptune was the first planet found by mathematical prediction rather than by empirical.
Neptune was found after the found of Uranus. When scientists found Uranus, they noticed that the way Uranus was rotating was a little strange, then they knew the reason it was rotating strangely! There was another planet making it rotate like that! So the scientists started their work----the work of finding another planet. Few years after Neptune was discovered. They named Neptune after the Roman god of Sea, because the planet's blueness reminded people of water.
by studying artifacts found on earth
Yes, that is true. Pluto was found in a similar way, but it's not classed as a planet now.
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Neptune