... Black Hole Signature From Advective Disks . ... If alone, a black hole would indeed appear quite black, but many black hole candidates are part of binary star systems. So how does a black hole binary system look different from a neutron star binary system? ... Sunspots: Magnetic Depressions . ... Our Sun has spots! These spots appear dark in photographs like the one above, but in fact sunspots are quite bright - they are just dark compared to the rest of the Sun. ... Blue Sun Glaring . ...