SEEN IN THE HEADLINE PIC ABOVE - Left: Sirius A and Sirius B, shown in an image taken by the Hubble Space Telescope. The white dwarf can be seen to the lower left. (NASA, ESA, H. Bond/STScI, M. Barstow/University of Leicester) Right: A man of Mali's Dogon tribe. (Ferdinand Reus/Wikimedia Commons) By Tara MacIsaac, Epoch Times Skeptics and proponents of the ancient aliens theory have faced off for decades on the issue of the Dogon tribe's allegedly advanced astronomical knowledge. Here's a look at some of the arguments on both sides concerning this tribe from Mali, Africa, and its purported knowledge of the motions of a star not visible on Earth without modern telescopes. What The Dogon Are Said to Have Known Sirius is the brightest star in the sky and had a prominent place in many ancient cultures. Sirius, which is about 8.7 light years from Earth, has a white dwarf companion star, Sirius B. Sirius B cannot be seen with the naked eye, and astronomers first guessed at its existence in