It's in reference to the appearance of the dense band of stars in the night sky that make up the Milky Way. With all the light from countless stars coming together, it's almost a cloudy or milky appearance. For more information, see http://curious.astro.cornell.edu/question.php?number=94

I heard the ancient Greeks called our galaxy the Milky Way because they thought it was made from drops of milk from the breasts of the Greek goddess Hera...

For what its worth, galaxay comes from the Greek "galactos" meaning milk.

Sad that you have to ask - if you lived in the country and looked up, the answer would be obvious. The plane of the galaxy is visible in the sky, when not obscured by artificial lighting, as a broad ribbon of stars, with many of them so small and distant that you see them not as individual stars but just a general lightness, or milkiness, arching across the sky. Here's a picture: http://www.darksky.org/resources/information-sheets/is111.html

It's called the Milky Way, because... I think it was the Greeks? that looked up at the sky and decided it distinctly looked like breast milk (I think it was human breast milk at least) dropped across the entire sky, so hence the name... I believe, anyway, it could just be one of those kids tales you get told in school

becuz it came for man boobs

1) "There are many creation myths around the world which explain the origin of the Milky Way and give it its name. The English phrase is a translation from Greek Γαλαξίας, Galaxias, which is derived from the word for milk (γάλα, gala). This is also the origin of the word galaxy. Indians call it the Akashganga or a celestial form of the holy river, Ganga. In Greek myth, the Milky Way was caused by milk spilt by Hera when suckling Heracles. The term Milky Way first appeared in English literature in a poem by Chaucer. "See yonder, lo, the Galaxyë Which men clepeth the Milky Wey, For hit is whyt." —Geoffrey Chaucer, Geoffrey Chaucer The House of Fame, c. 1380." Source and further information: http://en.wikipedia.org/wiki/Milky_way#Etymology_and_beliefs 2) "Egyptian In Egyptian mythology, the Milky Way was considered a pool of cow's milk. It was deified as a fertility cow-goddess by the name of Bat (later on syncretized with the goddess Hathor)." "Greek and Roman The Greek name for the Milky way (Γαλαξίας Galaxias) is derived from the word for milk (γάλα, gala). One legend explains how the Milky Way was created by Heracles when he was a baby. His father, Zeus, was fond of his son, who was born of the mortal woman Alcmene. He decided to let the infant Heracles suckle on his divine wife Hera's milk when she was asleep, an act which would endow the baby with godlike qualities. When Hera woke up and realized that she was breastfeeding an unknown infant, she pushed him away and the spurting milk became the Milky Way. A story told by the Roman Hyginus in the Poeticon astronomicon (ultimately based on Greek myth) says that the milk came from the goddess Ops (Greek Rhea), the wife of Saturn (Greek Cronus). Saturn swallowed his children to ensure his position as head of the Pantheon and sky god, and so Ops conceived a plan to save her newborn son Jupiter (Greek Zeus): She wrapped a stone in infant's clothes and gave it to Saturn to swallow. Saturn asked her to nurse the child once more before he swallowed it, and the milk that spurted when she pressed her nipple against the rock eventually became the Milky Way. Older Greek mythology associates the Milky Way with a herd of dairy cows/cattle, where each cow is a star and whose milk gives the blue glow. As such, it is intimately associated with legends concerning the constellation of Gemini, with which it is in contact. The constellation was named for the twins, Castor and Polydeuces, who sometimes raided cattle. In addition, Gemini (in combination with Canis Major, Orion, Auriga, and the deserted area now called Camelopardalis) may form the origin of the myth of the Cattle of Geryon, one of The Twelve Labours of Heracles-" Source and further information: http://en.wikipedia.org/wiki/Milky_Way_(mythology) (please add a ")" at the end after following the broken link to get to the right address)