The Jupiter-like planet, they say, is part of a solar system which once belonged to a dwarf galaxy.
This dwarf galaxy was in turn devoured by our own galaxy, the Milky Way, according to a team writing in the academic journal Science.
The star, called HIP 13044, is nearing the end of its life and is 2000 light years from Earth.
The discovery was made using a telescope in Chile.
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