Argument: Many more unmanned scientific missions can be sent to Mars
Gregg Eastbrook. "Why We Shouldn't Go to Mars." Time. Jan. 26, 2004: "It is interesting to note that when President Bush unveiled his proposal, he listed these recent major achievements of space exploration: pictures of the rings of Saturn and the outer planets, evidence of water on Mars and the moons of Jupiter, discovery of more than 100 planets outside our solar system and study of the soil of Mars. All these accomplishments came from automated probes or automated space telescopes. Bush's proposal, which calls for "reprogramming" some of NASA's present budget into the Mars effort, might actually lead to a reduction in such unmanned science--the one aspect of space exploration that's working really well."