Everything we now know about the universe-from the behavior of quarks to the birth of entire galaxies-has stemmed from scientists who've been willing to ponder the unanswerable.Everything we now know about the universe-from the behavior of quarks to the birth of entire galaxies-has stemmed from scientists who've been willing to ponder the unanswerable. And with the advent of modern science, great minds have turned to testing and experimentation rather than mere thought as a way of approaching and grappling with some of the universe's most pressing and vexing dilemmas.

So what is our latest picture of some of the most inexplicable features of the universe? What still remains to be uncovered? What are some of the next avenues of exploration for today's chemists, physicists, biologists, and astronomers?

"We know a lot about the universe. But there's even more that we don't know," says astrophysicist and Professor Neil deGrasse Tyson, director of the Hayden Planetarium, an award-winning lecturer, and one of the world's foremost experts on the secrets of the universe. And his course The Inexplicable Universe: Unsolved Mysteries is the perfect gateway into this mind-bending and eye-opening subject. This visually stunning course, which has been honored with a 2013 Telly Award for Outstanding Educational Program, features six self-contained lectures that transport you on a marvelous journey to the frontiers of the known (and unknown) universe and introduce you to tantalizing questions being addressed by the world's top scientists. Undeniably engaging and fascinating, this lecture series is a wonderful entrée to scientific pursuits that lie at the very heart of the history and nature of our universe.

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CH1. History's Mysteries
CH2. The Spooky Universe
CH3. Inexplicable Life
CH4. Inexplicable Physics
CH5. Inexplicable Space
CH6. Inexplicable Cosmology