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Which of these are actual evidence for the existence of a black hole in the center...

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Physics

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

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