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. During "loss of signal" periods, viewers will see a blue screen.
When the station is in darkness, external camera video may appear black, but can sometimes provide spectacular views of lightning or city lights below.
The International Space Station flies 400 km (250 miles) high at speeds that defy gravity – literally. At 28 800 km/h (17 500 mph) it only takes 90 minutes for the weightless laboratory to make a complete circuit of Earth. Astronauts working and living on the Station experience 16 sunrises and sunsets each day.