And intriguingly, according to images taken by NASA's Hubble Space Telescope, the object isn't just growing one tail - it's also sprouting a separate "anti-tail," pointing in the direction of the Sun,as Harvard astronomer Avi Loeb suggests in a new, yet-to-be-peer-reviewed paper. "The anti-tail is an extension of the glow of scattered sunlight around 3I/ATLAS towards the Sun and not away from it - as typically the case for comets," Loeb explained in a new blog post. "This anomalous anti-tail, not a result of geometric perspective, had never been reported before for solar system comets."