Probably the most famous photograph ever taken by the Hubble Space Telescope is of the „Pillars of Creation“, a star-forming region inside the Eagle Nebula (M16). Astronomers always wanted to know just how much star formation is actually going on inside the nebula. So one of Hubble’s co-observatories, the Chandra X-Ray Observatory, has observed the region too, and helped answer that question.
The Eagle Nebula (M16): Peering Into the Pillars Of Creation