Seven years later, what can we make of our first confirmed interstellar visitor?

In 2017, astronomers identified the first known interstellar object to have entered our solar system, now commonly known as ʻOumuamua. A relatively small body, estimated to be roughly the size of a skyscraper, ʻOumuamua transfixed scientists with its peculiar properties and inspired endless ‘it must be aliens’ takes from a fascinated public – and at least one Harvard astrophysicist. In this entertaining lecture from January 2024, Chris Lintott, professor of astrophysics at the University of Oxford and professor of astronomy at Gresham College in London, makes the case that, while this object’s fleeting presence in our solar system wasn’t coordinated by extraterrestrial life, it still has much to teach us about the nature of the Universe.