Since its launch on July 23, 1999, the Chandra X-ray Observatory has been NASA’s flagship mission for X-ray astronomy, taking its place in the fleet of “Great Observatories.
This is what they have to say about the observatory. But, actually though this website is designed to be a connection between people and the Chandra observatory, it happened to include some great educational resources.
If you are in the search of a great place to start your journey in inter-galactic science, then the chandra.harvard.edu, is your answer.
And, if you are interested only in those educational resources, here is where you must go : Education