a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction; the fossil record showing no indication of the origin of human life; however it seems every day is found another form of human life;
so u have an enormous variety of human life w/ no distinct place of origin spread over all the earth w/ intimate knowledge of the whole skies;
yet it would seem at times w/ no knowledge of the earth itself; the age of discovery from the European POV: Asia, Africa, the New World; Australia et al, Polynesia; all unknown lands unknown to white man & white man unknown to the natives; all living on a single planet;
how then at this very time every far flung civilization on earth had already mapped the stars
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Sagittarius A or Sgr. A is a complex radio source at the center of the Milky Way. It is located in the constellation Sagittarius, and is hidden from view at optical wavelengths by large clouds of cosmic dust in the spiral arms of the Milky Way.
It consists of three components, the supernova remnant Sagittarius A East, the spiral structure Sagittarius A West, and a very bright compact radio source at the center of the spiral, Sagittarius A*. These three overlap: Sagittarius A East is the largest, West appears off-center within East, and A* is at the center of West.