... Hydrogen, Helium, and the Stars of M10 . ... Stars like the Sun use hydrogen for fuel, "burning" hydrogen into helium at their cores through nuclear fusion. ... For a while, hydrogen burns in a shell surrounding the stellar core and the star expands to become a red giant. ... Twenty years ago this month, NASA's Voyager 1 spacecraft flew past Jupiter and its moons. ... NGC 2997 from VLT . ... Add another 8-meter telescope to the list of modern optical telescope giants. ... A Jupiter Venus Conjunction...