what illuminates a planetary nebula
Four Main Types Of Nebulae. Planetary Nebulae: These are called such because they look like a planet when viewed with a small telescope. One of the best examples of a planetary nebula is the Ring Nebula (M57) in Lyra.Reflection Nebulae: A reflection nebula does not emit any visible light of its own, and shines only because the light from an embedded source illuminates its dust.our Main Types Of Nebulae. Planetary Nebulae: These are called such because they look like a planet when viewed with a small telescope. One of the best examples of a planetary nebula is the Ring Nebula (M57) in Lyra.