Prepare to go where no man has gone before :D
This website comes straight from NASA. It holds images of Planets, Stars, Constellations, Meteors, Space Stations, Galaxies etc.
It also contains images rovers take while being on different missions. They have given information about the rock structure found in space missions, videos of there experiences,
3D Images, Images of Space Shuttle, Catalogs , Information sorted out on an yearly basis, Astronauts interviews and their experiences and so much more.
Some of the best ones I like are those of International Space Station, The Mars Rover, the Pathfinder, the Cassini and the Hubble Telescope.
They have an amazing sets of records in that website and Space lovers won't take their eyes off the content.