A hundred years ago, astronomer Edwin Hubble dramatically expanded the size of the known universe. At a meeting of the ...
Somewhere in between, humans realized the universe is much larger than our Milky Way — that the spiral ... something very ...
The sharpest images yet of a supermassive black ... Most galaxies have supermassive black holes, but the one in the Milky Way is inactive, meaning the galaxy is as well. The extragalactic AGN ...
Nature of the nebulae In 1610, astronomer Galileo Galilei used the newly invented telescope to show that the Milky Way was composed ... it appears. Hubble worked hard, taking images of spiral ...