Where Are Heaven and Hell?

If heaven and hell do exist, where are they? Firstly, in which dimension are they? They cannot be in our physical dimension, as we can only go there after we die, in our soul. Religions often teach that heaven is up, hell is down. But we know that the earth is a sphere, so up and down are only empty space. Hence, this cannot be accepted.

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Also, we know that the earth is revolving round the Sun. Does that mean that heaven and hell are moving together with the earth? That would require the theory of parallel existance to be true, meaning that heaven and hell are same in location as the earth but in a different mode of existance (there is the theory that in the same location, many things can exist together, but at different frequencies; thus, if ghosts and spirits are true, then they are vibrating at a frequency different from ours, that is why we cannot interact with them).

At the same time, the whole Solar System is travelling at a high speed through the Universe. So heaven and hell must also be attached to the Solar System in some way if they exist.

But if that is true, then are they meant for humans living on earth only? What if there are other intelligent life like us on other planets? Would they be talking about the same heaven and hell, or do they have their own?

This is a puzzle to me, and no religious teachings seem to have any answers. There are many stories of people who had NDE (near death experiences), where they seemingly die and leave their bodies, but somehow return to their bodies later. During the short period, some of them reported experiences of hell or heaven. Usually the duration of their experiences are short, like minutes or a few hours. If we believe them to be true, then heaven and hell cannot be far away.

Or are these experiences mere imagination or hallucination, as most scientists would like us to believe?