Current planetary science confirms that the lunar surface is constantly bombarded by micrometeoroids at speeds ranging from 10 to 70 km/s, leading to a process known as "space weathering." However, this paper highlights a fundamental contradiction: if the universe were an empty vacuum without any braking medium, interstellar dust and supernova debris would enter the Solar System at speeds of hundreds of km/s (200–500+ km/s) due to the relative motion of stars and explosion velocities. The absence of an expected population of micro-craters from such hypervelocity impacts on the lunar surface, combined with the lack of extreme rock erosion, suggests that this material must be significantly decelerated before reaching the inner Solar System.I propose the hypothesis that the observed limitation on impact velocities of incoming particles is direct empirical evidence for the existence of a universal cosmic medium. This medium acts as a braking force (F∝v2), effectively filtering high-velocity projectiles from the galactic environment
Aleš Hrůza (Wed,) studied this question.