Astronomy is, or rather was, a visual science. For thousand of years man used little but their eyes to observe and record the light from the stars. This changed dramatically 400 years ago when Galileo first turned a telescope towards the heavens, expanding our ability to see and understand. Yet for the next 350 years, the potential of this magnificent device was limited merely to the tiny sliver of the spectrum visible to human eyes. Only in the last 50 years or so have a series of technological advances given us access to the hidden cosmic domains of radio waves, x-rays, ultraviolet light, infrared light. Layer by layer the cosmic onion has been peeled away to reveal a reality stunningly different from what we thought we knew about a merely visible universe. This book attempts to show the fundamental change in worldview brought on by expanding our perceptions to cover the full spectrum of light.