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Chance microlensing events enable astronomers to probe distant quasars

1 July 2016 Astronomy Now

Some galaxies pump out vast amounts of energy from a very small volume of space, typically not much bigger than our own solar system. The cores of so-called active galactic nuclei (AGNs) can be billions of light-years away, so are difficult to study in any detail. However, natural gravitational ‘microlenses’ can provide a way to probe these objects.