Scientists estimate the object to be more than 12-miles-wide, speeding at 37 miles-per-second, relative to the sun.

Harvard astrophysicist Avi Loeb has cowritten a research paper speculating whether the comet 3I/ATLAS is in fact "hostile" ...

In 2017, the mysterious interstellar object 'Oumuamua passed through our Solar System, sparking a heated debate about its ...

I/ATLAS is just the third recorded interstellar object to enter the solar system. However, the scientific consensus is that ...

Instead, scientists are looking into existing spacecraft already in orbit around other planets. Harvard Professor Avi Loeb has proposed redirecting one or more of them to intercept 3I/ATLAS, including ...

The strange 3I/ATLAS comet that was recently discovered to be speeding through our solar system could actually be the work of ...

"The consequences, should the hypothesis turn out to be correct, could potentially be dire for humanity," said Avi Loeb.

A controversial new paper questions whether the interstellar object 3I/ATLAS is a potentially dangerous alien probe, similar ...

Though SETI scientists believe aliens would likely use similar technology as we do on Earth, that assumption poses a fundamental, possibly insurmountable, challenge to their search: Our own ...

CAMBRIDGE (CBS) -- A Harvard University professor is making the case that we are likely not alone in the universe. Astronomer Avi Loeb's new book "Extraterrestrial" examines the 2017 flyby of a ...