3I/ATLAS is the size of Manhattan Island and it's following an impossible trajectory that visits Mars, Earth, Venus, and Jupiter like it's on some kind of planned tour. Harvard professor Avi Loeb looked at the data and thinks we're looking at humanity's first confirmed alien spacecraft. But here's the terrifying question - are they here to study us peacefully, or have we just attracted the attention of something far more dangerous than we ever imagined?
