Cometary globule CG4. Image credit: NOAO. Click to enlarge This object looks like a comet, but it’s actually a star forming region called CG4. Cometary globules like this are relatively small clouds of gas and dust in the Milky Way. CG4 is about 1,300 light years from Earth; its head is about 1.5 light-years across, … Continue reading "Cometary Globule CG4"