In this excellent in-depth article, Sottnet gathered data showing that Earth was probably subjected to cometary events (direct impact and/or overhead explosions and/or electric disruptions) in 14,400 BP, 10,800 BP, 7,200 BP and 3,600 BP. A short summary: A catastrophic event, probably of a cometary nature, occurred ca. 14,400 BP. This number piqued my interest because it is a multiple of 3,600 (4 X 3,600 = 14,400). An astronomical body following a very elliptical orbit around the Sun with a 3,600 year period can not be a planet but has to be a comet. Similarly to 14,400 BP, 3,600 BP was marked by a sudden drop in temperature. The 7200 BP (5200 BC) Events are similar to 14,400 and 3,600 BP, we discover a sharp temperature drop revealed by ice core analysis Only one date remains: the 10,800 BP event (3 X 3,600). Just like the three preceding dates, we notice a sudden drop in temperatures around 10,800 BP: There is a clear correlation between vulcanism and cometary activity...

The Hubble Space Telescope has captured the best pictures yet of our newest interstellar visitor. This comet called comet 21/Borisov from outside our solar system is zooming by us at a blistering 110,000 mph (177,000 kph). Hubble caught some glam shots over the weekend from a distance of 260 million miles (420 million kilometers). It's the second known interstellar visitor to swoop through our solar system. The first identified interstellar visitor, an object officially named 'Oumuamua, swung within 24 million miles of the Sun before racing out of the solar system. Read full article including Hubble Timelapse of Interstellar Comet 2I/Borisov at: https://phys.org/news/2019-10-hubble-telescope-interstellar-visitor.html