selected
Galileo Galilei became the first person to observe the planet Neptune, although he mistakenly catalogued it as a fixed star.
Related Wikipedia articles
Galileo Galilei
Florentine physicist and astronomer (1564–1642)
Galileo di Vincenzo Bonaiuti de' Galilei, commonly referred to as Galileo Galilei or mononymously as Galileo, was an Italian astronomer, physicist, and engineer, sometimes described as a polymath. He was born in the city of Pisa, then part of the Duchy of Florence. Galileo has…Source: Wikipedia (CC BY-SA)
Neptune
Eighth planet from the Sun
Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth. Compared to Uranus, its neighbouring ice giant,…Source: Wikipedia (CC BY-SA)
Fixed stars
Astronomical bodies that appear not to move relative to each other in the night sky
In astronomy, the fixed stars are the luminary points, mainly stars, that appear not to move relative to one another against the darkness of the night sky in the background. This is in contrast to those lights visible to the naked eye, namely the planets and comets, which appear…Source: Wikipedia (CC BY-SA)