On earth the rule is that תתאה גבר, if kosher and not kosher mix in a hot application, it depends which is “תתאה” bottom. If the hot is bottom it’s all forbidden, if the top is hot than it’s only forbidden through the “peel”. How does the rule of תתאה גבר apply in deep space where there effectively 0 gravity. If I had a hot piece of meat floating stationary in space and shook a pot of cold milk at it. Is the meat considered תתאה and so it’s totally forbidden or is the milk and so you would only have to remove a “peel”? Or is there some third option? sefaria link to rule of תתאה גבר

  • How do you define top and bottom in space?
    – robev
    Dec 23, 2020 at 13:01
  • Might be relevant is the Issur VeHeter I believe says תתאי גבר works by the top one weighing down on the bottom, which probably doesn't happen in space
    – robev
    Dec 23, 2020 at 13:02
  • The basic defnintion of "top and bottom" in earth orbit would be bottom is toward the earth, top is away from the earth. But once you leave earth orbit, that definition will change. When on the moon, you would have the effects of moon's gravity and bottom would be toward the moon, top away from the moon. Keep in mind, even in earth orbit where gravity appears to be zero, you are still in the earth's gravitational field. Also, keep in mind you can simulate the effects of earth's gravity in space by use of a centrifuge. Just saying, it is not that simple a question.
    – Dennis
    Dec 23, 2020 at 16:13
  • @Dennis 1) what about if you had a centrifugal cooker which you had meat spinning g around in. And then at an exact moment where the meat was pointed up towards the sky you squirted milk at it?
    – mroll
    Dec 23, 2020 at 19:31
  • 1
    @Dennis I specifically said deep space in my question to avoid the whole relative gravity issue.
    – mroll
    Dec 23, 2020 at 19:32


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