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[[FILE:BlackHole Lensing.gif|border|right|thumb|Simulation of [https://en.wikipedia.org/wiki/Gravitational_lens gravitational lensing] by a [https://en.wikipedia.org/wiki/Black_hole black hole] ]]
[https://en.wikipedia.org/wiki/Astronomy Astronomy] , a natural science that studies [https://en.wikipedia.org/wiki/Astronomical_object celestial objects] and phenomena.
[[Category:Various Engine Classifications]]
