Very interesting! Venus's atmosphere is so dense that it would take large sized and cohesive asteroidal bodies to penetrate to the surface with sufficient energy to blast surface rocks high up into the Venusian atmosphere. That may have happened in the distant past when such large collisions...
Ooops! Big mistake, NASA! You can't see Mars as a crescent from the Moon, or anywhere in the Earth-Moon system. The smallest phase it can have is around 90%, i.e. 'large gibbous'.