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Uranus was discovered by William Herschel on March 13, 1781, 229 years ago.

Neptune, however, was first observed on September 23, 1846, only 164 years ago.

Of course they had been in the solar system for a few billion years.

It's just that they weren't in our model of the solar system, until discovered.

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10y ago
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1mo ago

Yes, Uranus and Neptune have always been part of the solar system. They were discovered in the late 18th and mid-19th centuries, respectively. Uranus was discovered in 1781 and Neptune in 1846.

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Q: Was Uranus and Neptune in the solar system 200 years ago?
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It orbits round the Sun in an orbit between Saturn and Neptune, one trip round takes 84 years.


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Neptune was formed around 4.5 billion years ago, along with the other planets in the solar system. Neptune is the fourth largest planet, after Jupiter, Saturn, and Uranus. Almost identical in size to Uranus, its sister planet, Neptune was formed, along with the other planets, from the primordial Solar Nebula. While the larger planets (Jupiter and Saturn) received the lion's share of the nebula's hydrogen and helium, Uranus and Neptune appear to have received only rock and ice


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