You are watching a live feed from the International Space Station 
The ISS web cam is the most expensive web cam ever developed, so please get your money's worth watching it. 
It cost $100 Billion more than the BugZapper Cam in my yard.  

Learn more about NASA TV
See where the Space Station is right now

International Space Station
Push the Play button to watch a live view of the ISS
During "loss of signal" periods, viewers will see a blue screen. 

Live streaming video by Ustream

Live video from the International Space Station includes internal views when the crew is on-duty and Earth views at other times. The video is accompanied by audio of conversations between the crew and Mission Control. This video is only available when the space station is in contact with the ground. Since the station orbits the Earth once every 90 minutes, it experiences a sunrise or a sunset about every 45 minutes. When the station is in darkness, external camera video may appear black, but can sometimes provide spectacular views of lightning or city lights below.