An astrophysicist at Harvard University believes he may have found proof of extraterrestrial life not by studying the vast night sky, but by combing the bottom of the Pacific Ocean.

Last month, a crew aboard a boat called the Silver Star embarked on an expedition to Papua New Guinea with the mission of recovering fragments from a mysterious meteor that had crashed into Earth in 2014.

During the two-week excursion, the team scoured over 100 miles of ocean bed before recovering 50 tiny spheres composed of a metallic substance they say is unmatched to any existing alloys in our solar system.

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The spheres — which are so miniscule that they require a microscope to see — require further testing to determine whether they’re natural or technological in nature. Depending on the findings, the objects could be the first time that humanity has found solid evidence of interstellar beings.

In other words, aliens.

“Our findings open a new frontier in astronomy of studying what lies outside the solar system through microscopes rather than telescopes, said Avi Loeb, a professor and astrophysicist at Harvard University, who led the expedition as its chief scientist.

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The fragments the team uncovered are believed to be from a basketball-sized meteorite that in 2014 slammed into the Earth’s atmosphere and into the western Pacific Ocean.

Originating from outside the solar system, the meteor moved at a speed two times faster than nearly all of the stars in the vicinity of the sun, Loeb said. Though too small to be noticed by telescopes through its reflection of sunlight, its collision with Earth generated a bright fireball recorded by U.S. government sensors, Loeb added.