Astronomers using the Hubble Space Telescope have discovered a "ultra-massive white dwarf that formed when a white dwarf merged with another star," according to the Goddard Space Flight Center. Credit: NASA's Goddard Space Flight Center Paul Morris: Lead Producer Music Credit: "Zero Gravity" Brice Davoli [SACEM] via Koka Media [SACEM], Universal Production Music France [SACEM] and Universal Production Music