Main categories
Missions --Popular missions, an A-Z list of all missions and the continuously updated launch schedule
Galleries -- Image of the Day, other NASA image galleries, and the latest NASA videos
NASA TV -- 24/7 live streaming of the Public, Media, and Education channels as well as Hi-Def views of Earth from the space station
Follow NASA -- A list of social media accounts, upcoming social events, chats, and ways to get involved
Downloads -- Apps, ringtones, podcasts, and E-Books
About -- Agency leadership and organization, center locations, careers
NASA Audiences -- Content for Media, Educators and Students
Topics
International Space Station -- Blog updates, videos and images from humanity's home off the planet
Journey to Mars -- Updates on the Orion spacecraft, Space Launch System rocket, Asteroid Redirect Mission, current Mars missions and all the plans to send humans to the Red Planet in the 2030s
Earth -- Images and science from the fleet of spacecraft observing and studying the home planet
Technology -- The latest NASA innovations driving future and current exploration
Aeronautics -- NASA research on cutting edge aviation and improving air travel
Solar System and Beyond -- News and images from the many missions exploring our neighboring planets and their moons, and peering deep into the cosmos to answer fundamental questions
History -- The story of America's space agency from the early days of Mercury, Gemini and Apollo to today
Benefits to You -- NASA technology that changes life here on Earth
Sections
All missions, topics and other major sections of the web site have an additional level of navigation designed to help you dig deeper into that topic with an overview, image and video galleries and a link to media resources.
NASA wants to put all this content at your fingertips on your phone or tablet as well. Simply click the three horizontal lines -- some call it a "hamburger" -- at the top right to pull down the navigation. 3-2-1 Blast Off!!!