Question

mission to mars

1. martians have invaded earth in novels, films, and comic books. but science fiction cannot answer the question: are humans alone in the universe? aerospace engineer robert zubrin carries the answer lies 34 million miles away — on mars.

Explanation:

This is a text completion task focused on logical and contextually appropriate vocabulary for a passage about Mars and the question of extraterrestrial life.

1. "invaded" fits the first blank because science fiction often depicts Martians attacking/invading Earth in media like novels, films, and comics.
2. "alone" fits the second blank as the core scientific question being posed is whether humans are the only intelligent life in the universe.
3. "argues" (replacing "carries") fits the third blank because Robert Zubrin is putting forward a position that the answer to the question is on Mars; "carries" is not contextually logical here.

Answer:

1. invaded
2. alone
3. argues