The differences are based on tradition, practical concerns (such as space), and cultural norms.

No space, such as Euclidean space, is required to contain it.

They tracked objects against various backgrounds such as the earth and distant space.

The samples are taken approximately uniformly over the resource of interest, such as time or space.

This memory could be another string, a pointer, or something completely different such as unallocated space.

Her writings included topics such as structure, time, optics, and space.

Light travels fastest in a vacuum, such as outer space.

Concepts such as "relative space" didn't explain the phenomenon; they only added to the mystery.

Basic elements such as movement, space, action and time, all expressed through the human figure, are reflected in her work.

Our ancestors had to bring abstract concepts such as time, space, and distance to bear on the problem of getting from one place to another.