Interstellar comets, generally believed to be very rare visitors to our Solar System, might be very much more common than normally assumed, two US astrophysicists have suggested. The scientists concerned are Amir Siraj and Avi Loeb of the Centre for Astrophysics/Harvard & Smithsonian. The question of interstellar comets was first seriously raised when the first such body, dubbed the Borisov comet, was detected in 2019. It travelled through the Solar System at a speed of some 177 000 km/h, and remains the only such object so far discovered.
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