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Some of the main reasons:

- Cost

- Lack of public support

- Time: It would take to get to and from Mars. Six months to get there, staying there for 18 months(waiting for Mars and the Earth to line up) and six months back.

- Physiological problems due to space travel like bone degeneration (from lack of gravity) and radiation exposure that we have not yet resolved.

- Psychological effects of prolonged space travel like limited room/ human contact.

- Limits of current technology to allow us to carry sufficient supplies (oxygen, water, food) the necessary distance

- Lack of appropriate habitat to support astronauts during the time they would have to stay on the planet's surface

- No real good reason to go. (Yes, it would be neat, epic even, from an historical standpoint, but Mars itself has not shown to have anything useful to people)

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13y ago

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