An ‘interstellar visitor’ spotted drifting into our solar system weeks ago is either a massive dirty snowball or an alien probe. At least, this is according to a leading UFOlogist and a Harvard ...

There’s a visitor in town, and its name is 3I/ATLAS. The presumed interstellar comet presents a rare opportunity for astronomers to study an object born a long time ago in a star system far, far away.