Harvard's top astronomer professor Avi Loeb, just published a book called Extra-Terrestrial, The First Sign Of Intelligent Life Beyond Earth. He believes that in 2017, the highly unusual object that passed by earth for a visit called Oumuamua was likely alien.

So in this episode, we go deep into obvious hypotheses, the attributes and characteristics that prove that Oumuamua was not a comet or an asteroid or anything else we've seen before and why the good professor thinks it was likely alien. We discuss why he thinks science is a “dialogue with nature” and why at massive personal risk, he decided to come forward with his theory.
Science as a Dialogue with Nature
Avi says that science is a way of appreciating and understanding the world and is not in conflict with religion either. Science explains how things work and it increases your own understanding of nature. Additionally, he says that he's frustrated because many scientists focus on concepts without evidence and have no connection to experiments:
"There is no evidence that these ideas are valued and that they actually describe nature. To me, that's a betrayal of traditional physics, where we were supposed to have a dialogue with nature, not a monologue. We're not supposed to tell nature what it is but listen for experiments to what nature is." - Avi Loeb
The Discovery of Oumuamua
Christopher and Avi talk all about the likely alien, Oumuamua. Avi says that before discovering Oumuamua, they haven't seen an object in outer space that moves too fast and more powerful from the gravitational pull. And so, this ability to escape the gravitational pull of the sun was a huge discovery and led to the idea that an alien passed by the Earth for a visit.
"It's just that it's relative speed. If a bullet moves too fast relative to the earth or, if a spacecraft moves too fast, it will never fall. It would just escape. So the issue is how fast does an object move relative to the source of gravity. All the objects we have seen before were bound to the sun that was relics from the formation process of the solar system." - Avi Loeb
Claims About Oumuamua
After discovering Oumuamua, astronomers claimed that it was just a comet or an asteroid that came near the Earth. Another object with an extra push similar to Oumuamua's was also discovered, but it turns out it was a rocket booster that left the Arabs in 1966. This event somehow proved that Oumuamua is indeed peculiar.
"The actual discovery of Oumuamua is by itself a puzzle. It means that the abundance of such objects is much greater than would be expected from the rocks that occupied the solar system at any event. Putting that aside, this object was peculiar because it exhibited an extra push of the type that you expect from a comet." - Avi Loeb
To know more about  Harvard’s Top Astronomer and the Aliens Who Tried to Contact Us, download and listen to this episode.
Bio:
Abraham (Avi) Loeb is the Frank B. Baird, Jr., Professor of Science at Harvard University. 

He received a Ph.D. in Physics from the Hebrew University of Jerusalem in Israel at age 24 (1980-1986), led the first international project supported by the Strategic Defense Initiative (1983-1988), and was subsequently a long-term member of the Institute for Advanced Study at Princeton (1988-1993).

Loeb has written 8 books, including most recently, Extraterrestrial (Houghton Mifflin Harcourt, 2021), and