Approximately 359 million light years away from the Earth, the galaxy appears to belong to a class of rarely observed, Hoag-type galaxies, the researchers said.
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"Less than 0.1 per cent of all observed galaxies are Hoag-type galaxies," said lead author Burcin Mutlu-Pakdil from the University of Minnesota at Duluth in the US.
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The majority of observed galaxies are disc-shaped like our own Milky Way.
Galaxies with unusual appearances give astronomers unique insights into how galaxies are formed and change.