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There are 100,000,000,000 stars in the Milky Way, but we only know of 25 which are travelling fast enough to escape our Galaxy. Bizarrely, these stars are mostly found in one part of the sky near the constellation of Leo.
Douglas talks through the ways that we think 'fast' stars can be made in the Milky Way and show that each fails to explain these stars. He then argues that these stars were born in an entirely different galaxy, the Large Magellanic Cloud. An origin in the Large Magellanic Cloud would explain all the properties of these stars, but would also imply there are thousands more of these stars in a stellar stream covering one-third of the sky. This prediction will be tested definitively in April 2018 by the European Space Agency's Gaia space telescope.