... Tonight's Sky . ... The lowest-mass white dwarf . Researchers uncover our galaxy's lowest-mass white dwarf. ... This artist's conception shows the lowest-mass white dwarf known in our galaxy and its companion star, which likely is another white dwarf. ... This photograph from the Sloan Digital Sky Survey shows the lowest-mass white dwarf known in the galaxy (marked with an arrow). ... The fact that the companion is a more massive white dwarf or neutron star is also consistent with theory." ...