"Based on extensive user feedback and testing, we've modernized NASA.gov to work across all devices and screen sizes, eliminate visual clutter, and put the focus on the continuous flow of news updates, images and videos we know you're looking for. We've simplified our image and video galleries to emphasize viewing and sharing the content, and organized that content around NASA's areas of work, like the Journey to Mars and exploration of the Solar System and Beyond. And we've made the content more "discoverable," by connecting features and images to related content through an "infinite scroll" of similar content and clickable topic labels that take you to pages with more related content."
Keith's note: Many people just type "nasa.gov" in their browser - like I do. Try that and see what happens - or click here: http://nasa.gov/. Some (but not all) browsers automatically add "www".