"This is the single most bullet-proof observation that I can think of that we've made this entire mission."
- STEVE SQUYRESlead researcher for Nasa's Spirit and Opportunity Mars rovers, hails the discovery of mineral deposits as the strongest evidence yet that water once flowed on Mars
"To be blunt: long."
- MARTIN ZELLEuropean Space Agency's head of astronauts, when asked how an international crew of researchers felt about a grueling 520-day simulation of a flight to Mars, which ended Friday. The all-male crew conducted the mission in a Moscow facility
"When the very first human steps on Mars, I will be able to say, 'Yeah, I helped do that.' That will make me feel very proud.
- DIEGO URBINA,one of six volunteers who will spend 18 months inside a sealed facility with no windows as part of a project that aims to simulate a mission to Mars and study the effects on the participants
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