Okay, so I'm thinking about creating a website about astronomy. One thing I'd like to do is to include a lot of figures from journal articles. But I fear that including these diagrams will violate copyright. Are there certain journals that pretty much allow anyone to post figures without violating copyright? I know that Wiki is a good place to start (as all the images there are under the creative commons license), but I'd like to highlight examples/figures that aren't on Wiki, since my website will be useless if it just gets everything from Wikipedia.