The surface of the Earth is the shore of the cosmic ocean. From it we have learned most of what we know. Recently, we have waded a little out to sea, enough to dampen our toes or, at most, wet our ankles. The water seems inviting. The ocean calls.

— Carl Sagan

Below is part 1 of the Cosmos episode this is from. The full episode is available here. You can find all the Cosmos episodes here.

Youtube Video