The giant black nebula rests on top of a thick star field. The dark black nebula, made up of dust and gas, is likely a star forming region. Located in the constellation Scorpio, the nebula spans up to 40 light-years across. The dark black cloud, a cometary globule, is shaped by the ultrviolet radiation that is emitted by the bright stars that surround it. The red color comes from hydrogen gas. The small blue reflection nebulae around the dark cloud are hot young stars embedded in cosmic dust. Some say that the dark cloud looks ominous against the bright background. The name dark tower is an allusion to Shakespeare's play "King Lear," in which Gloucester's son Edgar acts as though he is a crazy begger, named Tom. Tom says, "Child Rowland to the dark tower came, His word was still 'Fie, foh, and fum, I smell the blood of a British man'." This was also referenced in a poem by Robert Browning.
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