Lots of reasons, which have been spelled out in many other posts, but which deserve to be collected together.
- Because we must
Over ten year ago, the discovery of an ancient impact crater in Mexico and subsequent exhaustive study of it finally convinced the bulk of the scientific community that it was the impact of a large (but relatively speaking, not particularly large) meteor that triggered the climate change responsible for killing off the dinosaurs and most of the species that surrounded them, rather than gradual atmospheric shifts natural to the planet. (Read James Lawrence Powell’s exellent book Night Comes to the Cretaceous for a fantastic account of the vicious oppostition put up by other scientists to this notion.)
Several near miss scares in subsequent years have shown: a) the threat is still very real; b) we lack the observational capability to give ourselves more than a few months warning (and even that is of highly dubious accuracy) of any such approaching calamity. One more meteor, one we might not even realize is on its way, and we’re all gone. I for one would like to know that there is a viable place to escape to were it to happen in my lifetime. Are we going to just pile whoever we can into whatever rocket we can scrape together in a few months (if it turns out we have that long), shoot them to the moon, and pray they can figure out a way to sustain the race before they run out of air a few hours after landing? Come on!
- Because we’re America
If we don’t make the push beyond earth, China will. They have a growing space program, and thanks to our consumer demand for prices so low that all manufacturing has moved to Asia, they will have all the money they need. In the broad humanist view, it might not matter what country wins the prize of the first viable moon colony as long as it happens, but I would like it to be my country, especially given that we have all the resources here right now. I would hate to think that all we have learned will go to waste because we thought we needed to save the money today.
There are two main objections to manned space flight:
- The risk
Ah, so suddenly, after this explosion, we’re worried about risk? Just a few short years ago, when rich idiots paid tens of millions of dollars to fly with the Russians, weren’t we criticizing NASA for being a bunch of wusses who were artificially upping the perceived risk in order to keep space flight to themselves? Now we know the risks are real, and the person who knowingly undertakes them should be given a hero’s welcome and, if necessary, a hero’s burial. All the people of the past who dreamed that their children’s children’s children would reach for the stars would not appreciate cowardice on our part.
NASA tests every step of their missions to the extent their budget allows before they go ahead with them. Why didn’t we land to the moon until Apollo 11? Because earlier Apollo missions had to lower the lander to near the lunar surface, then blast back up to make sure it could be done. Because the Gemeni program had to show we could dock vehicles in space so that the lander would have a place to go once it left the moon. Because Jet Propulsion Laboratory missions had to land on the surface first and return samples so we knew what kind of lander we needed.
People think we can get by with only our unmanned program, but it has limits. Rovers will reach Mars in 2004. If they find a scientifically significant hill they can’t climb, the rover that can climb it won’t get there until 2010 at the earliest. If there’s a hole at the top of the hill the rover can’t descend into, the rover that can won’t get there until 2016. Better to have an intelligent human there instead. But the human must travel through a vacuum for six months, live in a low-pressure, low-gravity environment for a year, and travel back, all with no supply line. We’re not even close to discovering if this can be done. It will take time. And risk.
2)The cost
Poor, poor NASA (in every sense of the term), the government’s favorite whipping-program. Any politician who wants to score points on budget-cutting screams about our supposedly wasteful space program. You’d think NASA was cramming the money into the solid booster rockets as kindling. Every dollar spent on the space program is spent here on earth, given to Americans. And the perceived enormity of the expenditure is a load of crap. For every tax dollar you gave the government last year, they gave less than a penny to NASA. Why don’t you spend your energy asking where the other 99 cents went? Using the penny you gave them last year, NASA discovered the sure existence of water on Mars (which could be used for life support or rocket fuel), the internal structure of the sun, and the fate of the universe. What the heck better bargain are you looking for?
The Columbia crash happened because the government spent too little, not too much. NASA has been telling Washington for years it needs to go ahead with building the next generation of shuttles that have already been designed, but Washington says no. The first of these was to have been a Crew Return Vehicle for the Space Station, which George Shrub canceled as soon as he hit office. Forgive me for morbidity, but having displayed such stupidity, he deserves to have Columbia smeared across half his state (you know, the one where all the money to train the astronauts and monitor the flights at the Johnson Space Center is spent). He also cancelled the Centifuge module for the station, so it won’t be America who finds out if humans can survive long periods in low gravity. Hope the Chinese are willing to share the moon.
The mistake we constantly make is to demand that the space program pay off in the short term. You can argue about where specific products come from, but NASA and its Technology Transfer Program has been instrumental in shaping the way we live our day to day lives. In the end, the space program, manned and unmanned, is about long-term goals. Always has been, always will be. And shame on any of us so short-sighted as to think it must be otherwise.