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When the Universe was young, it was nearly smooth and featureless. As it grew older and developed, it became organized.
We believe that most of the matter in the universe is dark , i.e. cannot be detected from the light which it emits (or fails to emit).
Dark Universe / Transient Universe | Outer Solar System | Near Earth Objects | Milky Way | LSST Tour Dark Matter | Dark Energy | 3D mass Illustration of strong gravitaional lensing.
Estimated distribution of matter and energy in the universe, today (top) and when the CMB was released (bottom)
In the 1978 follow-up album to "Born to Run," Bruce Springsteen uses darkness on the edge of town as a metaphor for the desolate unknown we all face as we grow up and try to understand the world. Cosmologists working to decipher the origin and fate of the universe must identify completely with The Boss' sense of tragic yearning.