Space- A continuous, available, or unoccupied area. Terms: Absolute magnitude, Absolute zero, and Absorption lines Depth- <span>the distance from the top or surface of something to its bottom. </span>Terms: D<span>eepness, D</span><span>istance downward, and D</span>istance inward Mass- A coherent, typically big body of matter with no definite shape. Terms: Pile, and Heap