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.

“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.

June 9: Histories Mysteries

June 16: The Spooky Universe

June 23: Inexplicable Life

June 30: Inexplicable Physics

July 7: Inexplicable Space

July 14: Inexplicable Cosmology