A brief visit from a red and extremely elongated interstellar asteroid

@article{Meech2017ABV,
  title={A brief visit from a red and extremely elongated interstellar asteroid},
  author={Karen J. Meech and Robert J. Weryk and Marco Micheli and Jan T. Kleyna and Olivier R. Hainaut and Robert Jedicke and Richard J. Wainscoat and K. C. Chambers and Jacqueline V. Keane and Andreea O. Petric and Larry Denneau and Eugene. A. Magnier and Travis A. Berger and Mark E. Huber and Heather Flewelling and C. Z. Waters and Eva Schunova-Lilly and S. Chastel},
  journal={Nature},
  year={2017},
  volume={552},
  pages={378-381}
}
None of the approximately 750,000 known asteroids and comets in the Solar System is thought to have originated outside it, despite models of the formation of planetary systems suggesting that orbital migration of giant planets ejects a large fraction of the original planetesimals into interstellar space. The high predicted number density of icy interstellar objects (2.4 × 10−4 per cubic astronomical unit) suggests that some should have been detected, yet hitherto none has been seen. Many… 
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