Cosmology (Knox)
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Contemporary knowledge regarding the expansion of space, cosmological distances and redshifts, the cosmic microwave background, early thermal history of the universe, Big Bang nucleosynthesis, the cosmic microwave background, dark energy, and dark matter.
Thumbnail: The Flammarion engraving is a wood engraving by an unknown artist that first appeared in Camille Flammarion's L'atmosphère: météorologie populaire (1888). (Public Domain; Heikenwaelder Hugo via Wikipedia)