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The Helmi stream is a stellar stream of the Milky Way galaxy.
The star is part of the Helmi stream, a former dwarf galaxy that merged with the Milky Way between six and nine billion years ago.
However, the star is part of the Helmi stream of stars, a leftover remnant of a small galaxy that collided with and was absorbed by the Milky Way over 6 billion years ago.
It was also determined that the planet was most likely not captured from another star in the Milky Way after Helmi stream became a part of the galaxy, implying that HIP 13044 b indeed originated outside the Milky Way.
According to evolutionary theories, HIP 13044 was formed in another galaxy, and became part of the Milky Way when the star's parent galaxy was absorbed by our own between six and nine billion years ago, the remnants of the galaxy forming the Helmi stream.
Wörterbuch für Astronomie