... In fact, the teardrop is about the size of our own Solar System and is racing against time to condense and form planets. 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? ... Our Sun has spots! ... Sunspots are about the size of the Earth and frequently occur in groups, as shown above. ...