In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...
A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the ...
The image shows the Arches star cluster, 25,000 light-years away, captured through infrared observations from Hubble and ground-based telescopes. This Hubble image shows NGC 6397, a star cluster 8,200 ...