This infrared image from NASA's Spitzer Space Telescope shows a striking example of what is called a hierarchical bubble structure, in which one giant bubble, carved into the dust of space by massive stars, has triggered the formation of smaller bubbles.
Chandra :: Photo Album :: NGC 6240 :: April 2013 An enormous cloud of hot gas is surrounding two merging spiral galaxies. This gas reservoir contains the mass of 10 billion suns, spans light years, and radiates at more 7 million degrees.
The Sword Of Orion ~ The Orion constellation is noticeable for three medium-bright stars in a short, straight row. These stars represent Orion’s Belt. If you look closely, you’ll notice a curved line of stars “hanging” from the three Belt stars.