Newly declassified US government records include mysterious infrared footage, astronaut accounts from NASA missions and unexplained sightings dating back decades.

A comet that is likely much, much older than our solar system has spent months traipsing through Earth's cosmic neighborhood. And at long last, NASA has unveiled an unprecedented look at the object, named 3I/ATLAS. And no, it's not an alien spaceship.

The interstellar comet 3I/ATLAS was the third object ever discovered in our solar system that originated from another star system. Despite a viral conspiracy theory, NASA officials have repeatedly stated that 3I/ATLAS is a comet and not an alien spaceship.