It is its age.
According to prevailing theories the universe has not existed for an infinite amount of time but is approximately fourteen billion years old.
bacteria
Some physicists believe that if wormholes exist, there is the possibility that time loops exist. Theories of time loops have existed since the 1950s.
the amount of goods produced at a certain time is called productivity
In that case, the object is said to move at constant speed.
The amount of work in each unit of time is "power".
there's this thing called time...
anachronism
The distance that a wave travels in a certain amount of time is a wavelength. Wrong,it's speed.(:
This would be called a "goal".
The speed
expansion