three-dimensional – adj. appearing to have length, depth and width

survey – n. an examination of an area in which its measurements and details are recorded, especially for the purpose of creating a map

galaxy – n. a large group of stars from the same universe

gap – n. an empty hole or space in the middle of something

substantial – adj. large in amount

advance – n. new discoveries and inventions

pattern – n. the way something is often done or repeated

legacy – n. something that is left for people in the future