There are 16 space & space exploration cards in this set - astronaut, black hole, galaxy, Hubble space telescope, International space station, Milky Way, nebula, observatory, radio telescope, rocket, satellite, space shuttle, telescope, moon landing, astronomer, Galileo.These cards can be used in multiple ways.- use just the first set as flash cards or control cards.- use just the second set and match word to image/object.- as 3-part cards for matching picture to picture and word to word Gre