The Hubble captures U Camelopardalis—or U Cam, for short—a star nearing the end of its life in the constellation of Camelopardalis, near the North Celestial Pole. As it begins to run low on fuel, U Cam is becoming unstable. Every few thousand years, it coughs out a nearly spherical shell of gas as a layer of helium around its core begins to fuse. The shell of gas, which is both much larger and much fainter than its parent star, is visible in intricate detail in Hubble's portrait. While phenomena that occur at the ends of stars' lives are often quite irregular and unstable, the shell of gas expelled from U Cam is almost perfectly spherical.