Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. For a while, hydrogen burns in a shell surrounding the stellar core and the star expands to become a red giant. Yet the bright blue stars apparent in M10 have evolved beyond the simple, hydrogen shell burning stage. In this image, only the barely visible, faint, gray-looking stars are likely to still be burning hydrogen at their cores.
Specific rights apply .