Optical Gravitational Lensing Experiment

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What Wikipedia says

The Optical Gravitational Lensing Experiment (OGLE) is a Polish astronomical project based at the University of Warsaw that runs a long-term variability sky survey (1992–present).

Excerpt from the Wikipedia article “Optical Gravitational Lensing Experiment”, under the CC BY-SA 4.0 license. Read the article on Wikipedia