Looking for
light in a gravity lens is extremely difficult and
by far the most complicated method to discover
stars, although it's been used just as often as
direct imaging. The process consists of viewing a
planet as it passes through a distant star and
watching the light bend due to the gravity of the
planet. Gravitational micro-lensing is a science
in its own and is one way to discover black holes
as well. Although it's difficult, it has
discovered more planets than our last method.
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