Quiet Zone: 704

Michael Holstine, business manager at the National Radio Astronomy Observatory, walks out of a shed underneath the Robert C. Byrd Green Bank Telescope. Standing taller than the Statue of Liberty, it's the largest fully-steerable radio telescope in the world. It's also incredibly sensitive -- so sensitive that it's able to detect energy in outer space that is equivalent to the energy emitted by a single snowflake hitting the ground.

Michael Holstine, business manager at the National Radio Astronomy Observatory, walks out of a shed underneath the Robert C. Byrd Green Bank Telescope. Standing taller than the Statue of Liberty, it's the largest fully-steerable radio telescope in the world. It's also incredibly sensitive -- so sensitive that it's able to detect energy in outer space that is equivalent to the energy emitted by a single snowflake hitting the ground.