What it takes to keep NASA's flagship Chandra observatory flying for a quarter century 

 To celebrate the 25th anniversary of the flagship Chandra X-ray observatory, NASA released a behind-the-scenes look at the work it takes to keep the $1.5 billion telescope flying in space. 

https://cdn.mos.cms.futurecdn.net/wNCSMAchsmHGFBoRpYGVf5.jpg

https://www.space.com/chandra-25-years-celebration-nasa