episode description
Everyone knows that eight planets orbit the Sun. But thousands of other objects, including icy comets and football field-sized asteroids, are also zooming around our solar system. And some of them could be on a collision course with Earth. Find out how these Near Earth Objects are being tracked and what scientists are saying should be done to prevent a deadly impact. It’s never the first planet you think of, but would you miss Neptune if it were gone? A young science author shares her version of a solar system without the planet farthest from our sun. 10,000 times smaller than the width of a human hair, you can’t see nanoparticles, but you can find them in everyday products like sunscreen and clothing. Find out why environmental and health concerns are mounting about exposure to nanomaterials, sparking a growing debate about their possible regulation. Ever wonder why your voice changes when you breathe helium? Physicist Paul Doherty investigates the resonance of the human voice.
