NASA Space Place : Explore Earth and Space : Science and Technology

An amazing and colourful webpage. Information is given about the GPS and the Quest for Pizza. An own spacecraft can be made. Special tasks can be activated as: Games, Crafts, Activities and Media.
The following questions get answered:
How exactly does GPS work?
Where do satellites go when they die?
What is laser?
How do we talk to faraway spacecraft?
Extra information is given about the following: Spacecraft, Telescopes, Inventions, Watching Earth, People, Everything!
Interesting topics varied at the bottom and keep stimulating curiosity as:
DSN Uplink-Downlink
How do we talk to machines?
How telescopes "see"?
Play the Spinoffs Memory Game
Space batteries!
3D Image Gallery