Astronomy Review- help?
The energy source at the center of our galaxy
a. is not visible at optical wavelengths.
b. produces gamma rays.
c. must be less than 10 AU in diameter.
d. all of the above
e. none of the above
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What are the properties of a Black Hole? that's your answer. I like B only.
d. all the above
But they are still debating if there is a black hole in the centre or not, and trying to get a visual evidence of the event rising. If they do, there is proof of a black hole if the centre. Does this mean all galaxies have a black hole in the centre?
D. All of the above.
d. All of the above