by Marlowe HOOD / Patrick GALEY Agence France Presse A newly observed interstellar comet is the most pristine visitor from outer space ever seen in our Solar System, according to a pair of studies released Tuesday detailing its unique characteristics. Pristine, in astronomical terms, describes a comet that has never passed close enough to a star to be transformed by its searing heat. 2I/Borisov was discovered in 2019 by Ukrainian astrophysicist Gennady Borisov […]