Sirius: Sirius is known as the dog star as it is part of the constellation Canis Major. Perhaps this is one of the most famous stars because it is the brightest star in the sky. But Sirius does something interesting under binoculars or a telescope: it changes colors. Sirius flashes through the colors very quickly. Can you count all the colors? In addition to this, Sirius is actually a binary system composing of Sirius A and Sirius B.

sirius a and b

Source Chicago Astronomical Society

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