 The study of an object from an aerosolar system is in full swing, as the interstellar object, known as Comet 2i Borisov, became the subject of ground-breaking research. The object orbits an aerosolar, making it an interstellar neighbour. The research, which is published in a highly respected science journal Nature Communication, has been centred on the Comet Borisov, which was discovered in August 2019 by an astronomer of the same name in his private observatory in the Crimean Peninsula. Borisov is one of only two objects, the other one being asteroid Amua Amua, found in 2017, that scientists believe come from an aerosolar system. In other words, these two objects were probably born in orbit around a different star other than Earth's Sun. In the months prior to the pandemic, an international team of scientists led by an marble observatory and planetarium astronomer Dr Bagnolo, led scientists on research based on data collected at the European Southern Observatory's very large telescope in Chile. From December 2019 to March 2020, the team used the VLT to study the polarisation of sunlight reflected from the cloud of dust, known as the coma at the head of the comet. Dr Bagnolo said it's a privilege to have this paper published in Nature Communications as it underlines the world-class research which is taking place here at our marble observatory. We tracked the comet's changing polarisation as it moved through the solar system, and polarisation is a property of the incoming lightwave that is used to diagnose the characteristics of a solid surface. After collecting and analysing the data, it was found that polarised light from Borisov behaves in a unique way, unlike what we observe from most other bodies in our solar system. And the only other object that comes close to Borisov in this respect turns out to be Comet Hillbop, a spectacular once-in-a-lifetime comet that graced Earth's skies in 1997. Although Hillbop is different from Borisov in that it almost definitely belongs to this solar system, it's probably only approached the Sun once before, perhaps in the third millennium BC, the remainder of its existence having been spent in the cold space far from the Sun and other planets. This led the team to propose that unique polarisation behaviour of Borisov is due to the extreme pristine conditions of its surface, having spent millions of years near absolute zero in the space between the stars. As an interstellar comet, Borisov is so far a one-off, but the team expects more objects like this to be found in a foreseeable future. But what do you guys think of these interstellar visitors? Are they more common than we think? Comments below and as always, thank you for watching.