A new theory about 'Oumuamua suggests the weird object that passed through our solar system in 2017 was a remnant of a Pluto-like world from another solar system. As one scientist said, "‘Oumuamua may be the first piece of an exoplanet brought to us."
Read MoreComputer simulations confirm that 'Oumuamua - an object from another star system that sped near our sun in 2017 - likely formed via a close encounter with its star. 'Oumuamua may have originated in a debris disk, they said, or even a shattered super-Earth.
Read MoreComet 2I/Borisov is the 2nd known object to pass near our sun from outside our solar system. Its 2019 pass near our sun might have been its first-ever interaction with a star. If so, it's among the most pristine, or unspoiled, objects yet known.
Read MorePhysicist Avi Loeb of Harvard believes we should take seriously the idea that 'Oumuamua - the 1st known object to pass through our solar system from interstellar space - might have been created by an alien civilization. His new book is called "Extraterrestrial."
Read More"What if extraterrestrial intelligences are not like us, but are found in the frigid reaches of the outer solar system, the extreme gravity of neutron stars, the brilliant cores of active galaxies, or the hearts of the richest galaxy clusters?"
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