Mysterious objects from other stars are passing through our solar system. Scientists are planning missions to study them up close
In late 2017, a mysterious object tore through our solar system at breakneck speed. Astronomers scrambled to observe the fast moving body using the world’s most powerful telescopes. It was found to be one quarter mile (400m) long and very elongated – perhaps 10 times as long as it was wide. Researchers named it ‘Oumuamua, Hawaiian for “scout”. ‘Oumuamua was later confirmed to be the first object from another star known to have visited our solar system. While these interstellar objects (ISO) originate around a star, they end up as cosmic nomads, wandering through space. They are essentially planetary shrapnel, having been blasted out of their parent star systems by catastrophic events, such as giant collisions between planetary objects. Astronomers say that ‘Oumuamua could have been travelling through the Milky Way for hundreds of millions of years before its encounter with our solar system. Just two years after this unexpected visit, a second ISO – the Borisov Comet – was spotted, this time by an amateur astronomer in Crimea. These celestial interlopers have given us …