What scale of telescope mirror diameter is suggested might be necessary to definitively confirm the existence of large (10 km) objects in the outer Oort Cloud?

Answer

Apertures measured in the hundreds of meters, or even kilometers.

To gather enough photons from such faint targets at those distances, estimates suggest a need for telescopes with mirror diameters significantly larger than currently built, possibly needing hundreds of meters or kilometers.

What scale of telescope mirror diameter is suggested might be necessary to definitively confirm the existence of large (10 km) objects in the outer Oort Cloud?

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