The study of the physical universe beyond the Earth’s atmosphere. Includes astrophysics, cosmology, and topography(extraterrestrial).
AAVSO: American Association of Variable Star Observers.
Apollo 11 AGC: Original Apollo 11 guidance computer source code for Command and Lunar module.
Cassini: Mission to Saturn. Cassini mapped the surface of this gas giant’s largest moon, Titan; along with observing the planet, rings, and more. Still working too, so keep updated with new discoveries via this site.
Discovery Flight Deck: 3D Interactive tour of the Space Shuttle Discovery
EAA: Encyclopedia of Astronomy and Astrophysics.
ExoPlanet: The Extra-solar Planets Encyclopedia.
Exoplanets: Interactive display of Exoplanet Orbit Database.
Galaxy Zoo: Learn how to classify galaxies and actually get to do it! This is the best volunteer job ever. You don’t even have to leave your desk to explore space!
Gnuastro: Linux only. Astronomical data analysis and manipulator.
Ipac: Infrared Processing and Analysis Center. Caltech community, helping to collect and make sense of all astronomy related missions. They are specifically focused on data that is infrared based.
Mars One: Find news about humanities future mars explorations.
NASA Astronomy Picture of the Day: Not only can you find awe inspiring(mostly public domain images), you also get sources and explanations of the content.
NASA’s Exoplanet Exploration Program: Searching for habitable planets and life.
NASA Technical Reports Server: (NTRS).
NASA -Youtube Channel: Videos that are from NASA or about related topics.
NeoWise Project: ‘Wise’ telescope being used as an asteroid finder. One of it’s most important discoveries was YP139 – a potential threat to Earth.
Open Exoplanet Catalog: Open source data on discovered extra-solar planets.
Planet Hunters: You can volunteer to help NASA discover more of the universe via image exploration.
Space Shuttle Discovery: Explore this retired shuttle with full 360 capabilities. You won’t become an astronaut, but you can say you saw the inside of a spacecraft(they don’t have to know you meant virtually).
SpaceX: Private space exploration company. Interesting contents.
Wise Telescope: Retired infrared light observing spacecraft. Find science news and more information about this incredible explorer. The multimedia gallery offers images, movies, simulations, and more.
Worldwide Telescope: Offline or Online visualization of the universe. Google earth alternative.