What could have made it interactive would be if you found a site that allows the user to click on different parts of the sun and learn about it each topic in an active way. Instead, the link posted just showed different images of the sun, accompanied by large amounts of text, making it a normal article. A better example of an interactive sun lesson would have been this website. On this site, users are able to guide themselves through various slides that they can view at their own pace. By doing this, the user is able to teach themselves about the things they are curious about first, which in turn, makes them more engaged.
The multimedia article by Mayer, Dow, and Mayer, notes how "instructional designers call for basic interactivity features in educational technology." Two examples that they gave of this is giving the user the ability to control the material at their own pace and making sure that the information flows sequentially. The interactive sun lesson accomplishes both of these goals. The website allows the user to go from one slide to another at their own pace. This is crucial for the user to properly absorb the information presented based on their cognitive needs. Some people may need more time learning certain concepts than others. In addition, each slide builds on the last, which allows the user to form connections and truly understand how the information fits together. Therefore, incorporating these elements would have made the article a better indicator of an interactive website.