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Even according to those that allow it, (assuming there are those who prohibit space travel,) the halachos of zmanei tefilah, shabbos and all zman related halachos get very complicated. So I assume also they would strongly discourage space travel, whereas flying on a plane doesn't nearly have the same issues (usually at most one or two tefilos). For the same ...


R' Menachem Kasher, in האדם על הירח, proposes that ומלאו את הארץ וכבשוה, "fill the land and conquer it," may be an inference to prohibit space travel. He also points to the danger involved.

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