Muslims aren't permitted to take a one-way trip to Mars, at least according to a Khaleej Times report about a fatwa they say was issued by the General Authority of Islamic Affairs and Endowment in the United Arab Emirates. "Such a one-way journey poses a real risk to life, and that can never be justified in Islam… there is a possibility that an individual who travels to planet Mars may not be able to remain alive there, and is more vulnerable to death." From the Khaleej Times:
Whoever opts for this "hazardous trip", the committee said, is likely to perish for no "righteous reason", and thus will be liable to a "punishment similar to that of suicide in the Hereafter".
The committee, presided by Professor Dr Farooq Hamada, said: "Protecting life against all possible dangers and keeping it safe is an issue agreed upon by all religions and is clearly stipulated in verse 4/29 of the Holy Quran: Do not kill yourselves or one another. Indeed, Allah is to you ever Merciful."