Hubble Space Telescope on Instagram: "The Blinking Planetary 👀 This nebula earned its nickname from the orblike clouds of glowing gas and dust surrounding the central star. More formally known as Caldwell 15, the Blinking Planetary is, as the name suggests, classified as a planetary nebula. This sort of nebula doesn't have anything to do with planets; however, they appeared like planets in early telescopes, earning them their name. Planetary nebulae are expanding shells of gas cast off from an