For Hubble Telescope's 30th birthday, NASA has given the public "What Did Hubble See on Your Birthday?" that allows you to see a photo of deep-space as it would have appeared.
The MISSE database contains a large amount of NASA materials test data that can now be easily accessed with a new online tool.
Try an online simulator of the main computer system of the Apollo program that successfully landed 12 astronauts on the Moon.
The Solar Sail Calculator lets you play with values significant for a Solar Sail launch system to see what can be achieved.
The Drake Equation determines how many intelligent, communicating civilizations are likely to exist in this Universe.
BurnSim is a solid rocket steady-state ballistic simulation software for the Windows platform
NASA have collected all of the equations necessary to calculate the thrust of a rocket engine. In a rocket engine, stored fuel and stored oxidizer are ignited in a combustion chamber. The combustion produces exhaust gas at high temperature and pressure which is passed through a nozzle which accelerates the flow. Thrust is thereby produced according to Newton's third law of motion