Portal:Spaceflight/Did you know/2008 Fortnight 11

…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?