Top Harvard Astronomer: Alien Ship May Be Among Us

Loeb argues that 'Oumuamua's behavior means it can't be, as is commonly imagined, a clump of rock shaped like a long potato, but rather an object that's very long and no more than 1 millimeter thick, perhaps like a kilometer-long obloid pancake - or a ship sail - so light and thin that sunlight is pushing it out of our solar system.
And while he's not saying it's definitely aliens, he is saying he can't think of anything other than aliens that fits the data. And he's saying that all over international news.
"Many people expected once there would be this publicity, I would back down," Loeb says. "If someone shows me evidence to the contrary, I will immediately back down."