1. Solar System Tour – An interactive tour of the Solar System.
2. WTFNASA.com – Find out about all the cool things NASA has done to make your life awesome.
3. TuurLievens.net/planets – Learn facts about the planets.
4. OMGSpace.net – Space is big.
5. Stars – Browse the nearest 100,000 stars.
6. PlanetHunters.org – Contribute to the search for unknown planets.
7. LiveFromSpace.com – Follow ISS as it orbits around the globe.
8. My Solar System – Simulate your own solar system.
9. APOD – NASA’s astronomy picture of the day.
10. HowManyPeopleAreInSpaceRightNow.com – Find out how many people are currently in space and who they are.