... In the center of the above image lies Barnard 163, a nebula of molecular gas and dust so thick that visible light can't shine through it. Tycho s Supernova Remnant . ... Tycho! burning bright In the darkness of the night, What exploding white dwarf star Did frame thy remnant from afar, In the distant deep dark skies Under gaze of human eyes? ... In silhouette against a crowded star field toward the constellation Scorpius, this dusty cosmic cloud evokes for some the image of an ominous dark tower. ...