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PARIS: When the first object ever known to have visited the Earth’s Solar System from outer space zoomed past in 2017, it was so strange that at least one leading astronomer was convinced it was an alien vessel. ....
Astronomers had long been searching for comet-like objects entering the Solar System from the vastness of interstellar space, but had never before observed one. ....
"All comets indeed give evidence … of a lot of bad luck, affliction, peril and danger," wrote German author Thomas Hartmann in 1606, reflecting the fact that for a long time comets were deemed to be bad omens ....
We have now discovered 30 039 near-Earth asteroids in the Solar System - rocky bodies orbiting the Sun on a path that brings them close to Earth's orbit. The majority of these were discovered in the last decade, showing how our ability to detect. ....