I don't really know from where in the Torah or from which Rabbi this comes from, but I've heard that the Torah prohibits leaving the planet. Maybe it is because every mitzvah is made for Earth only, or because the Mitzvot that rely on time (like Shabbat and Tefilot) can't be done outside the planet.

Is this a real prohibition? Is there anything in judaism that actually discusses this?

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    Well, we have a bunch of questions that discuss halachot in outer-space, so it seems that at least some rabbis permit it. – Scimonster Nov 1 '15 at 10:20
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    @DannySchoemann …jumping? – msh210 Nov 1 '15 at 14:09
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    @Gabe12 not the rebbi I'm quoting. He commented that the ozone hole began after the first manned space flight as a punishment. – rosends Nov 1 '15 at 15:23
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    @Scimonster There are halachot about what to do after (e.g.) missing davening. That doesn't mean that it's ok to miss davening. – Daniel Nov 1 '15 at 15:24

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.


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 reason it is discouraged to fly past the date line during sefirah, as it complicates when shavuos is.


Rav Aviner was asked how there would be room on Earth after the resurrection. His answer was that, according to Rav Kook, we would live on other planets.

The source seems to be in Rav Kook's Linvuchei Hador:

"כי ברב ההשתלמות ההדרגתית יתגלו עוד בנקל דרכים להתיישב בכוכבים רבים ובעולמות אין מספר."

So no.

  • Where are these words in לנבוכי הדור? The entire text is available on Sefaria.org – Chaim May 17 '17 at 14:14
  • Right, thanks. I added the link to the source. Rav Kook is talking about something slightly different than the way Rav Aviner is. – Josh May 17 '17 at 14:20
  • Maybe that's only after the Resurrection, when it's an oneis, but until then it would be forbidden? – DonielF Feb 21 at 19:00

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