A Cosmic Two-Step: The Universal Dance of the Dwarf Galaxies

A dwarf galaxy: A challenge for modern cosmology? This dwarf galaxy ESO 540-31 is more than 11 million light-years from Earth, in the constellation of Cetus (The Whale). (Luca LimatolaESA/Hubble/NASA)
A dwarf galaxy: A challenge for modern cosmology? This dwarf galaxy ESO 540-31 is more than 11 million light-years from Earth, in the constellation of Cetus (The Whale). (Luca LimatolaESA/Hubble/NASA)

Over the last few years we’ve been studying the orbits of dwarf galaxies and we expecting to find them buzzing at random around large galaxies...

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