Simplify the following text for a Grade 7 native English-speaking person.
Original: The Pioneer plaques are a pair of gold-anodized aluminium plaques which were placed on board the 1972 Pioneer 10 and 1973 Pioneer 11 spacecraft , featuring a pictorial message , in case either Pioneer 10 or 11 are intercepted by extraterrestrial life .
Simplified: The Pioneer Plaques were a pair of plaques that were launched into deep space on pioneer 10 and pioneer 11 .