The Egyptian and Kush civilizations shared similar religious beliefs and similar styles of art and architecture. Kush civilization is considered a satellite of Egypt civilization because their pyramids and tombs are similar, their art and architecture were much the same, and they had similar religious beliefs and gods. Both were situated in Africa (along the Nile river). The growth of the Kush civilization paralleled that of Egypt.
The Kush civilization is what the Egyptians called Nubia (an age-old connecter between Northern and Sub-Saharan Africa). It was ruled by Egypt before eventually becoming the Kush Empire.