What are the problems scientists are trying to solve in order to get to Mars? 5 reasonings

Durante el simulacro, los tripulantes experimentarán las mismas condiciones que si estuvieran viajando a Marte, con agua y comida dosificada, y comunicaciones limitadas.

Pero las condiciones psicólogicas, aunque duras, no son las únicas a las que un astronauta debe enfrentarse en un vuelo tan largo aún nunca realizado.

Los expertos auguran que costará al menos 25 años, que se reducen a 15 en las previsiones más optimistas, antes de que seamos capaces de viajar a Marte.

BBC Mundo se pregunta cuáles son los desafíos técnicos y humanos que han de vencerse antes de llegar hasta el planeta vecino

Explanation:

deseasie in europe              

answer: both considered peasants valued members of society.

explanation: the ancient chinese and indian empires were large asian empires that had the same problems with other big empires, they had to work hard and sometimes fight in order to keep them united, they both relied heavily on their capacity to trade and to send strange and rare items to europe, and had the father as the head of the house hold in both societies, but they didn´t considered pleasants as valued members of their society, they were the bottom of the social pyramid in both of their societies.