spacecraft – n. a vehicle that is used for travel in outer space

geophysicist – n. a scientist whose study deals with the physical movements and forces of the Earth

deposit – n. an amount of something (such as sand, snow, or mud) that has formed or been left on a surface or area over a period of time

astronautics – n. the science and technology of human space travel and exploration

pool – n. a small area of water

aquifer – n. a layer of rock or sand that can absorb and hold water

pole – n. either end of the imaginary line around which something, such as a planet, turns

geologist – n. a scientist who studies rocks, layers of soil, et cetera, in order to learn about the history of the Earth and its life

ideal – adj. exactly right for a particular purpose, situation, or person