You're asking for a term for measuring distance in space. There are actually several, depending on what kind of distance you're talking about! Here are a few:

* Light-year: This is the most common unit for large distances in space. It's the distance light travels in one year.

* Astronomical Unit (AU): This is the average distance between the Earth and the Sun. It's used for distances within our solar system.

* Parsec: This is a unit used for measuring distances to stars and galaxies. It's equal to about 3.26 light-years.

* Kilometer (km): This is a standard unit of distance, often used for smaller distances in space, such as the distance between planets.

So, the best answer depends on the specific distance you're interested in.

Do you have a particular type of distance in mind? That will help me give you the most relevant answer!