Maybe we don't need too many humans in space yet...
In somewhat related news, the mention above of Opportunity sent me to Google to see what the little dood was up to. Not only is it in the 14th year of activity on Mars, the mission page had a link to this story: Why No One Under 20 Has Experienced a Day Without NASA at Mars.
In the 20 years since Pathfinder's touchdown, eight other NASA landers and orbiters have arrived successfully, and not a day has passed without the United States having at least one active robot on Mars or in orbit around Mars.
That's pretty impressive, while also making me feel old. I remember hearing about the Mars missions in the mid-90s while in school and thinking how awesome it would be to see close-up pictures that weren't from before I was born. And now 20 years later, there are two rovers trundling around Mars, including one that has exceeded its primary mission almost 54 times over and another that shoots lasers, plus India has its own orbiter around Mars. And in general spaceflight over those 20 years: the ISS was launched, expanded, and still kicking; the shuttle program went through a rough retirement; and (evil?) genius Elon Musk has not only started resupply missions, but seems to have cracked the whole reusable rocket thing in a way that 20 years ago would have seemed impossible. SpaceX might even be on the verge of manned missions to ISS. Oh, and NASA is finally getting somewhere on their next-gen rockets and capsules, including the Orion test flight in 2014.
People talk about how we went to the moon with Apollo 11 in '69, and then started the shuttle launches in '81, but did nothing after that. And the '80s and mid-90's were kind of a lull... but it's becoming clear that the science wasn't standing still, even if it looked that way. With more resources, I'm sure there could have been less of a gap between the first shuttle launch and the next space era of the ISS, Mars exploration, and private spaceflight, but I'm still not sure we'd have humans on Mars yet, given how little we know about the radiation risk and the material sciences needed to shield people on the way and once they get there. Plus... there's been so much cool science with the space-based telescopes lately and Earth-based sensors, you start to realize just how little we know about anything.