The following items describe observational characteristics that could indicate that an object is either a white dwarf or a neutron star. Match each characteristic to the correct object.

•may be surrounded by a planetary nebula•emits most strongly in visible and ultraviolet•may be in a binary system that undergoes nova explosions•may be in a binary system that undergoes X-ray bursts•can have a mass of 1.5 solar masses•may be surrounded by a supernova remnant•may repeatedly dim and brighten more than once per second