Re:How can you... (Score 1)

There will always be things you could be doing instead of another. The real task is in actually doing some of them instead of sitting by and saying what you could be doing. Look at it this way: space travel is more important in the long-run than many give it credit for since there will come a time eventually that we will not be able to live only on this planet. Sure, you may say this will be in thousands of years but considering the enormous challenge that lies in space travel, lets just hope that thousands of years is enough time for us to learn how to do it. Last point, you mention waiting until we have better materials and reduced costs. How many modern materials do we take for granted today only because manned space flight has existed already. Velcro is perhaps the most famous item. Applying ourselves to aim for something will allow us to find the technologies needed, we wont develop them unless we try beforehand.