Hubble’s work pushed the field of astronomy forward, starting with his paper demonstrating that some objects exist outside ...

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 ...

Edwin Hubble was young and ambitious ... you can calculate its distance from how bright it appears using the inverse square law. The more distant the star is, the fainter it appears.

Hubble makes his mark Edwin Hubble was young and ambitious ... distance from how bright it appears using the inverse square law. The more distant the star is, the fainter it appears.