“Earth-Sized Telescope”?
it would take up the whole earth, or be the size of the earth but hanging off one spot of the earth - it doesn’t make sense to me.
Look up VLBI, very long baseline interferometry. While the image made from a few distant apertures (say, spanning a circle of 7000 miles diameter, e.g. the Earth) will have large diffraction artifacts that would be absent in the image of an image taken with an actual 7000 mile diameter telescope, the former image will nevertheless have features that are comparable sharp to those in the latter image. These sharp features can be extracted from the image, with the result that a sharp image can be constructed as if an actual 7,000 mile diameter telescope had been used.
Seen “Contact”, the movie? Array of dishes spread out on a plain that gathers much more information than a single small dish. Same principal, although the “small” single collection “dishes” are on different continents, and their information is combined into a whole.
Obviously you didn’t click on the link !
Lookup up synthetic aperture for an explanation of jow radiars/radio telescopes can be configured to provide higher resolutions.
"All the scientific inquiry and ambition has led to the widely ambitious Event Horizon Telescope, an international collaboration linking eight observatories to create a virtual telescope dish as wide as Earth.
Shazam, Sergeant Carter!
Scouts Out! Cavalry Ho!