Which of these are actual evidence for the existence of a blackhole in the center of the Milky Way, and which are not?
Stars are observed to disappear into the black hole
Bright quasar emission is detected from the center of thegalaxy
Telescopes have been used to take high resolution images of theblack hole's event horizon
Astronomers observe an extremely bright and compact radiosource
The closest approach of stellar orbits near the center of thegalaxy indicate the object is smaller than the solar system
Stellar velocities near the center of the galaxy indicate 4million times the mass of the sun inside their orbit
