It was the ancient Greeks who came up with the name "Milky Way" for our galaxy, believing it was created by the Goddess Hera spraying the heavens with her milk. In reality, the glowing derives from billions of stars, arrayed in a disc across the sky. But the Milky Way galaxy is so immense that the vast number of stars we can see are merely a tiny fraction of the total number, which is estimated at between 100 billion and four times that amount. Hanging together by gravty in a space that is 100,000 light years wide, most of these stars are hidden from us by the thick veins of an interstellar dust that block visible light. Our own Sun is located somewhere between 25, 000 and 28, 000 light years from the center of the galaxy.