So asks Dr. Larry Krauss in the NY Times..... (author of The Physics Of Star Trek)
A One-Way Ticket to Mars
NOW that the hype surrounding the 40th anniversary of the Moon landings has come and gone, we are faced with the grim reality that if we want to send humans back to the Moon the investment is likely to run in excess of $150 billion. The cost to get to Mars could easily be two to four times that, if it is possible at all.
There is, however, a way to surmount this problem while reducing the cost and technical requirements, but it demands that we ask this vexing question: Why are we so interested in bringing the Mars astronauts home again?
To boldly go where no one has gone before does not require coming home again.