+**Contraction** is the act of becoming smaller, often through a drawing together of parts. This fundamental process can be observed across diverse fields, from a [Muscle](/wiki/muscle) fiber shortening in biology to a [Star](/wiki/star) collapsing under gravity, significantly altering [Density](/wiki/density) and internal structure.
+## See also
+- [Expansion](/wiki/expansion)
+- [Force](/wiki/force)
+- [Volume](/wiki/volume)
... 1 more lines