Planets form in disks of gas and dust around nearby young stars.  Radio telescopes are particularly good at exploring these planetary nurseries, because they allow us to peer deep into the dusty cocoons surrounding the young planets, as well as revealing the microwave emission from the small gas molecules that make up most of the mass of the disk.

The Atacama Large Millimeter/submillimeter Array (ALMA), the most advanced radio telescope ever built, has recently started operations in northern Chile, and it is revolutionizing our views of planet formation.  I will describe some of the ways in which we are using ALMA to unveil the planet formation process and learn about the properties of the youngest planetary systems.