In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...
It added that, “Caldwell 69 is one of over 100 objects in the Caldwell catalog: a list of galaxies, nebulae, and other cosmic wonders easily seen by amateur astronomers.” The image shared by ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback