From the outside, the Hayden Planetarium—a sphere measuring 87 feet (26.5 meters) in diameter—appears to float inside a six-story-tall glass cube. Inside, video programming, under the direction of renowned astrophysicist Neil deGrasse Tyson, offers glimpses of far-off galaxies, planets, and stars, all in ultra-sharp resolution. Visitors can witness the birth of the universe in the Big Bang Theater; walk the Heilbrunn Cosmic Pathway, which illustrates the history of the universe from the Big Bang to present day; and check outDark Universe, the planetarium’s popular space show that charts the discoveries that have led humankind to greater knowledge about the universe. (It’s narrated by Mr. deGrasse Tyson himself.)