valery polio cough spend four hundred thirty seven days on a mere space station apparently with no ill effects on his health. the next destination for human spaceflight is likely to be mars using today's technology a manned mission there would take around three years and the potential risks are very adventure are still being investigated. one recent study has shown that a journey to mars might be bad for your health doctors found that after as little as three months exposed to microgravity astronauts had changes to their brain structure. if you have the science question go to our website and send it in if we answer it on the show you'll get our d.v.d. featuring a lighthearted look at albert einstein's most famous theories. the most important thing is to never stop asking questions.