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Strong gravitational lensing

effect strong enough to produce multiple images, arcs, or even Einstein rings

Pronunciation
/strɒŋ ˌɡravɪˈteɪʃənəl lɛnziŋ/
/strɔŋ ˌɡrævəˈteɪʃənəl ˈlɛnsɪŋ/
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