Amir Siraj

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Amir Siraj
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CitizenshipUnited states of America
Alma materHarvard University

Amir Siraj is an American List of astrophysicist and student at Harvard University.[1] He is youngest scientist on the 2021 Forbes 30 Under 30 list.[2] Siraj's research pertains to Iinterstellar objects,[3][4][5][6] the Solar System,[7][8][9][10] extrasolar planetary systems,[11] black holes,[12] and supernovae.[13]

Siraj demonstrated that the Oort Cloud could have been formed as observed from ejected planetesimals from other stars in the Sun's birth cluster, indicating the possible former existence of a solar binary companion.[14] Siraj theorized a new method for detecting small black holes.[15] Siraj proposed searches for trapped interstellar objects in the Solar System,[16] stellar occultations caused by interstellar objects,[17] optical signatures of interstellar meteors in the Earth's atmosphere,[18] and electromagnetic radiation from collisions between interstellar objects and the Moon,[19] as well as impacts on neutron stars.[20] Siraj published constraints on the morphology of interstellar objects Oumuamua and 2I/Borisov,[21][22] reported the first discovery of a meteor that originated outside the Solar System,[23] and developed a method for determining the characteristic ejection speeds of interstellar objects from their parent planetary systems.[24]


  1. "CfA research on twin suns, 'Oumuamua, and Betelgeuse". Harvard Gazette. 2020-09-04. Retrieved 2020-12-09.
  2. "Forbes 30 Under 30 2021: Science". Retrieved 2020-12-07.
  3. Williams, Matt (2018-11-29). "There Could be Hundreds of Interstellar Asteroids and Comets in the Solar System Right Now That we Could Study". Universe Today. Retrieved 2020-12-07.
  4. CNN, AJ Willingham. "A meteor from another solar system may have hit Earth, and the implications are fascinating". CNN. Retrieved 2020-12-07.
  5. August 2019, Mike Wall 30. "A Telescope Orbiting the Moon Could Spy 1 Interstellar Visitor Per Year". Retrieved 2020-12-07.
  6. Williams, Matt (2020-11-07). "Vera Rubin Should be Able to Detect a Couple of Interstellar Objects a Month". Universe Today. Retrieved 2020-12-07.
  7. "Did the Sun have an early binary companion?". Cosmos Magazine. 2020-08-20. Retrieved 2020-12-07.
  8. Williams, Matt (2020-02-18). "There Could be Meteors Traveling at a Fraction of the Speed of Light When They Hit the Atmosphere". Universe Today. Retrieved 2020-12-07.
  9. "Interstellar Visitors Could Export Terrestrial Life to Other Stars". Eos. Retrieved 2020-12-07.
  10. Ciaccia, Chris (2020-09-27). "Meteors that brushed Earth's atmosphere may have brought life to Venus, study says". Fox News. Retrieved 2020-12-07.
  11. Carter, Jamie. "Asteroid Day: Any Life On The Closest Exoplanet To Us May Be Under Attack". Forbes. Retrieved 2020-12-07.
  12. Overbye, Dennis (2020-09-11). "Is There a Black Hole in Our Backyard?". The New York Times. ISSN 0362-4331. Retrieved 2020-12-07.
  13. "Ancient supernovas may have pierced moon rocks with star shrapnel". Popular Science. Retrieved 2020-12-07.
  14. Siraj, Amir; Loeb, Abraham (2020-08-18). "The Case for an Early Solar Binary Companion". The Astrophysical Journal. 899 (2): L24. doi:10.3847/2041-8213/abac66. ISSN 2041-8213.
  15. "ShieldSquare Captcha". doi:10.3847/2041-8213/aba119. Retrieved 2020-12-07.
  16. Siraj, Amir; Loeb, Abraham (2019-02-11). "Identifying Interstellar Objects Trapped in the Solar System through Their Orbital Parameters". The Astrophysical Journal. 872 (1): L10. doi:10.3847/2041-8213/ab042a. ISSN 2041-8213.
  17. "ShieldSquare Captcha". doi:10.3847/2041-8213/ab74d9. Retrieved 2020-12-07.
  18. Siraj, Amir; Loeb, Abraham (2019-06-07). "Probing Extrasolar Planetary Systems with Interstellar Meteors". arXiv:1906.03270 [astro-ph].
  19. Siraj, Amir; Loeb, Abraham (2020-08-01). "A real-time search for interstellar impacts on the moon". Acta Astronautica. 173: 53–55. doi:10.1016/j.actaastro.2020.04.006. ISSN 0094-5765.
  20. Siraj, Amir; Loeb, Abraham (2019-09-19). "Radio Flares from Collisions of Neutron Stars with Interstellar Asteroids". Research Notes of the AAS. 3 (9): 130. doi:10.3847/2515-5172/ab43de. ISSN 2515-5172.
  21. Siraj, Amir; Loeb, Abraham (2019-01-18). "'Oumuamua's Geometry Could Be More Extreme than Previously Inferred". Research Notes of the AAS. 3 (1): 15. doi:10.3847/2515-5172/aafe7c. ISSN 2515-5172.
  22. Siraj, Amir; Loeb, Abraham (2019-09-19). "An Argument for a Kilometer-scale Nucleus of C/2019 Q4". Research Notes of the AAS. 3 (9): 132. doi:10.3847/2515-5172/ab44c5. ISSN 2515-5172.
  23. Siraj, Amir; Loeb, Abraham (2019-06-04). "Discovery of a Meteor of Interstellar Origin". arXiv:1904.07224 [astro-ph].
  24. Siraj, Amir; Loeb, Abraham (2020-10-29). "Observable Signatures of the Ejection Speed of Interstellar Objects from Their Birth Systems". The Astrophysical Journal. 903 (1): L20. doi:10.3847/2041-8213/abc170. ISSN 2041-8213.

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