Life Beacons

Let's say for a moment that you're the Captain of a spaceship. And you're about to land on an uninhabited planet. When your Science Officer informs you that those 1000 lights you're seeing down there are emitting life signs. What is it about those lights that makes them special? And more importantly , how can you communicate with them to get permission to land? Rating G; Reading Level: Very Easy 5th Grade; Longest Words: Communicating