Alien
You know how 宇宙 is space? Well, a person from space is an alien.
うちゅうじん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will also help to know how to read the word 宇宙 on its own, too.
コウイチの写真は、火星で干ばつと大恐慌の犠牲となった宇宙人たちを正直に、かつ同情を込めてとらえている。
Koichi’s photographs honestly and sympathetically portray aliens who were victims of drought and the Great Depression on Mars.