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angular-resolution × 50telescope × 16
observational-astronomy × 12
radio-astronomy × 9
optics × 8
hubble-telescope × 6
photography × 5
interferometry × 5
adaptive-optics × 4
radio-telescope × 3
atmospheric-effects × 3
the-sun × 2
distances × 2
mars × 2
space-telescope × 2
astrometry × 2
naked-eye × 2
parallax × 2
newtonian-telescope × 2
cosmic-microwave-background × 2
very-large-telescope × 2
star × 1
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galaxy × 1