Users can select either an unframed or a framed version of the site. The site can be difficult to view for long periods of time. Site visitors can use the Preferences link to change the multimedia options. Visitors can choose to enter the site at a level based on their interest. The default is the intermediate level.
Most pages have an extensive navigation menu at the bottom.
Some sections do not allow users to navigate without the browser's back button. The Windows to the Universe Web site offers information and graphics about Earth and space sciences. Users will find scientific, artistic, historical, and cultural information. Viewers can also read the table of contents. The content of the site can be viewed at a beginner, intermediate, or advanced level.