3/ The artificial explanation has a known precedent because in 2002, astronomers found another object temporarily orbiting Earth and initially treated it as a possible asteroid. Spectroscopy later detected titanium-dioxide paint on its surface. The object, J002E3, was later identified as the third stage of the Saturn V rocket used to launch Apollo 12 in '69. Old space hardware doesn't always stay close to Earth. A rocket stage or a discarded panel can enter an orbit around the Sun similar to...