https://www.vice.com/en_us/article/g5vd4w/alien-hunting-astronomer-says-there-may-be-a-second-interstellar-object-on-earth-in-new-study

A pair of researchers who previously identified what may be the first known interstellar meteor to impact Earth have now presented evidence of a second object that could have originated beyond the solar system, before it burned up in our planet’s skies and potentially fell to the surface, according to a new study.

Amir Siraj, a student in astrophysics at Harvard University, and astronomer Avi Loeb, who serves as Harvard’s Frank B. Baird Jr. Professor of Science, suggest that a fast-moving meteor that burst into a fireball hundreds of miles off the coast of Portugal on March 9, 2017, is an “additional interstellar object candidate” that they call interstellar meteor 2 (IM2) in a study posted to the preprint server arXiv this week. The paper has not been peer-reviewed.