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What difficulties do astronauts face outside planet earth?

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Without gravity to push against, astronaut's heart will weaken and no longer circulate blood as it did on Earth. This could result in Dizziness, High blood pressure or serious Headaches. 2. read more

Without gravity to push against, astronaut's heart will weaken and no longer circulate blood as it did on Earth. This could result in Dizziness, High blood pressure or serious Headaches. With little opportunity to Exercise, muscles will weaken and making any small movement will be awkward and painful. read more

Therefore, for any other planet to have a good supply of oil then there would have to have been a large amount of forestation over an extremely large proportion of the planet for billions of years, just like the earth. read more

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NASA lays out three-phase plan for putting astronauts on ...
Source: cbsnews.com