Mysterious carving on a cathedral in Spain

Dark Roasted Blend featured an interesting article about a mysterious carving of an astronaut in the Ieronimus Cathedral in Spain. According to Dark Roasted Blend:

Inside the splendid Ieronimus Cathedral, built by Episcope de Salamanca in 1102 A.D., among the fascinating carvings of mythical animals and saints, we find - NASA Astronaut...
Maybe they entered some time portal while on the Moon, and ended up scaring medieval builders in Spain? Probably just a modern addition by the mischievous restoration team.