Harvard astrophysicist Avi Loeb has made a kind of second career out of being the person in the room who refuses to leave “aliens” off the table. With 3I/ATLAS, only the third confirmed interstellar ...

Comet 3I/ATLAS has already puzzled astronomers with its odd trajectory, twin tails and sudden bursts of activity. Now a rhythmic 16.16-hour “heartbeat” has become the latest mystery. Most researchers ...