According to the text, which three discoveries form the primary pillars of William Herschel's modern fame?

Answer

Discovery of Uranus, mapping the Milky Way, discovery of infrared radiation

His reputation rests securely on these three major achievements: finding a new planet, determining the structure of our galaxy, and extending the known electromagnetic spectrum.

According to the text, which three discoveries form the primary pillars of William Herschel's modern fame?
astronomyUranustelescopeAstronomerdiscoveries