For faint, far-off objects, which function is arguably the most scientifically important?

Answer

The ability to gather faint light from deep space.

The ability to gather faint light is considered the more scientifically important function, as gathering more light than the eye can reveals objects the eye could never see, regardless of magnification.

For faint, far-off objects, which function is arguably the most scientifically important?
Definitionastronomytelescopeinstrumentoptics