He's taking six of their people on the Mars expedition, though.

Mars expeditions with humans may therefore need new technology development for the descent process.

Without him the first Mars expedition would probably never have happened.

She had actually volunteered for it, recalling the first Mars expedition.

What do you think the chances are for the Mars expedition?

This was it, the final meeting of the Mars expedition until they were all once more on Earth.

"We are the only surviving members of the first Mars expedition."

"I was told that you were with the Mars expedition."

There the Mars expedition was sure to be taken seriously.

But the Mars expedition had provided the ultimate proof that, plan as you liked, things went wrong.