### time dilation

(relativity's ability to make time longer)

**Time dilation** is the effect that for some
objects, less time as passed than for others,
depending their position and velocity.
It is a consequence of relativity.

**Special relativity** implies time dilation based
upon the relative motion of two objects.
General relativity also produces time dilation depending
upon how curved space is, e.g., due to gravity
(**gravitational time dilation**)

Cosmological time dilation is the apparent
time dilation of events viewed from
large (high redshift) distances.

Time dilation challenges intuition based
upon daily experience, but is not only proven,
but some technology, such as **GPS**, requires
it to be taken into account, or it doesn't work.

(*physics,relativity*)
http://en.wikipedia.org/wiki/Time_dilation

**Referenced by:**

cosmological time dilation

radial velocity (RV)

index