Four astronauts launch to the space station as NASA grapples with strange twist in leak issue

A Russia-controlled module on the space station has been leaking for years. Now, operators are working to figure out if the issue is affecting the entire station.

​ A Russia-controlled module on the space station has been leaking for years. Now, operators are working to figure out if the issue is affecting the entire station. Read More Breaking News, Latest News and Videos | CNN