Astronomers are incredibly dedicated to outreach. You can get data used by professional astronomers in publicly-accessible databases on the web. Here's a collection of these resources: http://ned.ipac.caltech.edu/help/links.html The challenge is you have to learn a bit about the databases and visualization software to get going. Then you might need to learn some electromagnetism, relativity, and astrophysics to inter…
I really don't want to sound overly critical - I'm sure that there is good will behind whoever made the site you linked - but that site is what represents astronomers' dedication to outreach then I don't really know what to say...
See, if researchers really wanted to let their research known to the public the efforts on their behalf would be much, much more focused than what it took to put together that site. Take your average startup as an example - they're seriously dedicated to outreach, their success depends on it - would you give them even a 1% chance of success if their website looked like that?