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Extragalactic planet

From Simple English Wikipedia, the free encyclopedia

An extragalactic planet, known as an extragalactic exoplanet or an extroplanet,[1][2][3] is a star-bound planet or rogue planet located outside of the Milky Way Galaxy. Due to the very far distances to such worlds, they would be very hard to detect instantly. However, indirect evidence suggests that such far planets exist.[4][5][6] Nonetheless, the most distant planets known are SWEEPS-11 and SWEEPS-04, these two stars are located in Sagittarius with a distance of approximately 27,710 light years from the Sun, while the Milky Way is between 100,000 and 180,000 light years in diameter. This means that even galactic planets located farther than that distance have not been detected.


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  1. Smith, Kiona. "Extroplanet: Astronomers may have just found the first planet outside our galaxy". Inverse. Retrieved 2022-11-14.
  2. M51 ULS 1b - M51 Whirlpool Galaxy Extragalactic Planet Candidate, retrieved 2022-11-14
  3. Ramesh, Sandhya (2021-10-29). "NASA telescope may have just helped find the first planet spotted outside Milky Way". ThePrint. Retrieved 2022-11-14.
  4. Dai, Xinyu; Guerras, Eduardo (2018-01-31). "Probing Planets in Extragalactic Galaxies Using Quasar Microlensing". arXiv:1802.00049. doi:10.3847/2041-8213/aaa5fb. S2CID 119078402. {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: unflagged free DOI (link)
  5. "Latest Stories from National Geographic". National Geographic. Retrieved 2022-11-14.
  6. "Scientists Find Evidence of Thousands of Planets in Distant Galaxy". Gizmodo. 2018-02-05. Retrieved 2022-11-14.