... 6.07.2001 . ... Outward bound, this primordial piece of the solar system is still just visible to the unaided eye and can now be sighted by northern hemisphere skygazers as it moves through the constellation Pisces. ... This teaming ball of stars is the brightest globular cluster visible in Earth's northern hemisphere. ... 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. ... 2001 2002 . ...