A comet reportedly the size of Mount Kilimanjaro is hurtling towards the Sun. Scientists say the 'alien' rock has travelled from another solar system.
The 3.7 miles wide comet was first spotted in 1986 by a homemade cardboard telescope, and is set to have its closest approach to the sun in over five years today, having travelled inside the orbit of Mercury. Scientists believe its unusual orbit was caused by being ejected from its home solar system by the gravity of a giant exoplanet.
Following a collision with Jupiter, astronomers have indicated it began its odd trajectory, which has also travelled around our star, the Daily Mail reports.
