Happy Birthday Edwin Hubble.
Hubble was able to clarify something that had boggled astronomer’s minds for decades. The brilliant cluster of stars in the center of this image were long thought to be one, massive star with a mass somewhere between 200 and 300 times that of our own Sun. The clarity of Hubble’s imagery, however, enabled astronomers to determine that what had once appeared to be a single star was actually a cluster of several (still enormous) stars.
(see more — Hubble Telescope: Greatest Hits)
