The Inexplicable Universe: Unsolved Mysteries Series
What do scientists know about the universe? What still remains to be uncovered? What are some of the next avenues of exploration? Professor Neil deGrasse Tyson's course The Inexplicable Universe: Unsolved Mysteries is a marvelous journey to the frontiers of the known (and unknown) universe and introduces you to tantalizing questions being addressed by the world's top scientists.