The planets or comets are either too far away or too small to affect Earth’s crust to cause plate tectonics. The claim is on a par with claiming a gnat can affect an ocean going oil tanker. But there is a correlation between solar coronal cavities, (that’s where patches of magnetism are missing from the surface of the sun and takes place during solar polarity swaps, every 11 year solar cycle) can affect Earth creating earthquakes where it strikes Earth, (not everywhere, just where it hits). The aurora borealis is the result of solar wind from coronal cavities and from solar flares hitting Earth’s atmosphere and Earth’s own magnetism transporting the electrical stimulation to both poles. It’s actually essential to keeping Earth’s climate temperate, without them Earth would be a frozen popsicle.

Other than that you are plagiarising Ragnarok:

“In Norse mythology, Ragnarök is a series of future events, including a great battle foretold to ultimately result in the death of a number of major figures (including the gods Odin, Thor, Týr, Freyr, Heimdallr, and Loki), the occurrence of various natural disasters, and the subsequent submersion of the world in water. Afterward, the world will resurface anew and fertile, the surviving and returning gods will meet, and the world will be repopulated by two human survivors.”

The natural disasters being the rise of the midgard serpent Jörmungandr, who rises from the sea as a flaming serpent of fire, and creating massive tsunamis that drown the world.

Presumably the two survivors will dedicate the days of the week Tyr’s day (tuesday), Woden/Odin’s day (Wednesday), Thor’s day (Thursday), Freyr’s day (Friday) etc. to new deities.