Welcome to America Comes Alive!, a site I created to share little-known stories of America’s past. These stories are about Americans—people just like you—who have made a difference and changed the course of history. Look around the site and find what inspires you.
On September 23, 1846 German astronomer Johann Gottfried Galle discovered the planet Neptune at the Berlin Observatory. The planet has a diameter four times that of Earth, and it has eight known moons and a ring system. In 1989, the U.S. spacecraft Voyager 2 was the first human spacecraft to visit Neptune.