This image of prolific star-forming region RCW 49 exposes breathtaking detail of this dark and dusty region, which is home to more than stars. Credit: NASA/JPL-Caltech/E. Churchwell (University of Wisconsin - Madison)
Two extremely bright stars illuminate a greenish mist in this image from the new "GLIMPSE360" survey from NASA's Spitzer Space Telescope. The fog is comprised of hydrogen and carbon compounds called polycyclic aromatic hydrocarbons.
Nearly 14 billion years ago, due to a random fluctuation in a completely empty void, a universe exploded into existence. Scientists call this the Big Bang theory for the origin of the universe. But there are other theories .