Earlier this year, astronomers spotted a mysterious interstellar object, dubbed 3I/ATLAS, hurtling through the solar system ...

Is it a spaceship carrying aliens from a alternate universe? Could it be an 11-billion- year-old comment suddenly visible in ...

A senior Harvard astronomer has reignited speculation about the origins of a vast interstellar object hurtling through the ...

Discovered last month by a telescope in Chile, the comet known as 3I-Atlas is only the third known interstellar object to pass our way.

The latest observations of 3I/ATLAS suggest it resembles comets from the outer reaches of our solar system, but may be ...

NASA's Hubble Space Telescope got an up-close look at a headline-grabbing object known as 3I/ATLAS that has wandered into ...

A draft scientific paper, dated July 22, has proposed that the object, 3I/ATLAS, might be alien technology and could make a surprise attack on our planet.

Instead, scientists are looking into existing spacecraft already in orbit around other planets. Harvard Professor Avi Loeb ...

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

Harvard astronomer and alien hunter Avi Loeb is still holding onto hope that interstellar object 3I/ATLAS was sent to us by ...

From tracking a rare interstellar visitor to revealing hidden star systems, the SETI Institute is at the forefront of space science. Explore four recent stories showcasing our role in groundbreaking ...

This score means that it’s likely to have been engineered instead of being a naturally occurring force.