INCREASING APERTURE OF EXTREMELY POWERFUL TELESCOPES
ULT - 24 meters
NULT - 24+ meters
GT - 1.5-mile, 15-miles, 150-miles
PGT - 7,000 miles
MGT - 7,000+ miles based on adjunct number/position
PGT-ET - 7.5 billion miles (Solar System width)
PDT - 9 billion miles
GGT - 46.6 billion light years (Earth to the edge of Universe)
SRT - time rated
MMT - unknown
IET - limitless
M3T - 7,000 ++ miles
ET - additive formula
IT - additive formula
OT - 46.6+ billion light years (exceeding known universe)