Planets of Our Solar System
Our solar system officially has eight planets and one star: the Sun. The discovery of an object larger than Pluto in 2005 rekindled the debate over whether such objects, belonging to the Kuiper Belt – a collection of icy bodies located beyond Neptune – should be called planets. Pluto and other large members of the Kuiper Belt are now considered “dwarf planets.”
Alexander Keith Johnston, Atlas of astronomy, 1855. Herschel’s section of the Milky Way. Edinburgh/London.
Via LHL digital.
Discovering that the world was also round meant the people could use the system of celestial coordinates to describe points on Earth. The tricky thing was using astronomy to work out exactly where one must be. After all, the sky moved, and the Earth didn’t.
The beginning of the universe, for beginners - Tom Whyntie (by TEDEducation)