Becoming an Old One, I Take Her to the Surface to See the Stars

Think about whether life exists anywhere else in the vast universe, or only on Earth. Imagine being alone in the endless darkness... drifting through the void. Fear is an instinct that all living things possess for self-preservation. The oldest and strongest emotion of humankind is fear, and the oldest and strongest fear is fear of the unknown. In the year 1175 of the New Calendar, Earth left its orbit around the Sun, was cast out of the solar system, and drifted away from the Sun into endless darkness. Darkness and cold swept across the globe, and less than 30% of humanity survived. In the year 691, Earth passed through a dense cloud of dust, and countless meteorites carrying unknown energy crashed onto its surface. In the year 909, unknown creatures appeared on the surface, which had been frozen for thousands of years, while an unknown contamination seeped underground. This is a world where the sun, moon, stars, wind, rain, thunder, frost, snow, and hail can only be seen in books. [Slow burn + one heroine + Cthulhu + SCP. Not a wish-fulfillment story. Don't read if that's not your thing.]