Visible only with a telescope.

Roget 196: distant; far off, far away; remote, telescopic, distal, wide of; stretching to etc. v.; yon, yonder; ulterior; transmarine^†, transpontine^†, transatlantic, transalpine; tramontane; ultramontane, ultramundane^†; hyperborean, antipodean; inaccessible, out of the way; unapproached^†, unapproachable; incontiguous^†.    ... meer laten zien

Capable of discerning distant objects.

Having parts that slide one within another.