@keyframes girar {
from {
    transform: translate(-50%, -50%) rotate(0deg);
}

to{
    transform: translate(-50%, -50%) rotate(360deg);
}
}
 

.orbita{
    border-radius: 50%;

    animation: linear infinite girar;
}


.mercurio-orbita {
    
    animation-duration: 18s;

}


.venus-orbita{
    
    animation-duration: 24s;
}


.terra-orbita{
    
    animation-duration: 36s;
}


.lua-orbita {

    animation:
        girar 5s linear infinite;
}


.marte-orbita{
  
    animation-duration: 48s;
}


.jupiter-orbita{
  
    animation-duration: 60s;
}


.saturno-orbita{

    animation-duration: 90s;
}


.urano-orbita{

    animation-duration: 130s;
}

.netuno-orbita{
    
    animation-duration: 165s;
}