No, it is generally considered permissible (halal) in Islam to be an astronaut.
Everything is permissible in Islam unless explicitly forbidden by clear evidence in the Quran or Sunnah. There is no such prohibition on space travel. In fact, exploring the universe and seeking knowledge are encouraged within Islamic teachings.
- Exploration and Knowledge: Islam emphasizes the importance of seeking knowledge and understanding Allah's creation. Space exploration can be seen as a way to fulfill this obligation.
- No Specific Prohibition: There is no specific verse in the Quran or Hadith that forbids space travel.
- Practical Considerations: While there might be challenges related to prayer times, fasting, and dietary requirements in space, these can be addressed through interpretation and adaptation within Islamic principles. Muslim astronauts have already successfully navigated these issues.
Therefore, based on Islamic principles, becoming an astronaut is not considered haram.