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Two images of a crowded starfield as seen through a ground-based telescope show the subtle brightening of a star due to the effect of gravitational microlensing, where an invisible but massive foreground object passes in front of the star and amplifies its light.
Lone black hole passes in front of star (ground-based view)
Black Holes
Milky Way
This image was captured by a ground-based telescope at the Cerro Tololo Inter-American Observatory.
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