Hi, I'm in Science Olympiad and I need to know about Sagittarius A* (which is not the same as Sagittarius A). I cannot find much information on it, and I have to help teach others it tomorrow. Help? 
P.S. - Since it's Science Olympiad, I need it to be as detailed as possible. Thanks
P.S. - Since it's Science Olympiad, I need it to be as detailed as possible. Thanks