![nCube, a typical CubeSat](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f2/Ncube2.jpg/140px-Ncube2.jpg)
- …that a CubeSat (pictured) is a cube, 10 centimetres in all dimensions, weighing less than one kilogram?
- …that to date 90 Explorer satellites have been launched, the most recent being AIM in 2007?
- …that Luna 1 became the first object to enter a heliocentric orbit after a guidance failure led to it missing its planned lunar impact?