What is known about Sagittarius A*, the center of our galaxy?
Sgr A* at the center of Milky Way is probably a massive black hole of about a million solar masses (the mass of the Sun). The mass is estimated from the motion of gas and stars in the region. Although Sgr A* is gathering mass from its vicinity at a rate of about 10E-4 solar masses per year, a rather high rate, it is not as bright as would be expected. Therefore, Sgr A* is extremely inefficient (one part in 100,000) in converting the gravitational energy of the gathered material into radiation. Koji Mukai with helps from Drs. Chen, Loewenstein and Snowden Black Hole Appearance QUESTION: We are deeply indebted to you if you can help us in obtaining two representative images about: 1)the real image (picture) of a “black hole” (photographed) 2)the most distant part of the Universe ever photographed. ANSWER: 1) There are no “real” pictures of a black hole. This is because black holes themselves do not emit of reflect any light (that’s why they are called black holes), and they are too small
