New evidence from Hubble suggests that white dwarf stars could continue to burn hydrogen in the final stages of their lives, causing them to appear more youthful than they actually are. This discovery could have consequences for how astronomers measure the ages of star clusters, which contain the oldest known stars in the universe.
Click here for original story, Hubble Discovers Hydrogen-Burning White Dwarfs Enjoying Slow Aging
Source: NASA Goddard Center