So, as most of the flat Earth models I have received have come from Youtube, I have come to notice that it is generally flat with a dome above it where the stars, planet, etc. are "attached" to the dome with the exception of the Sun and Moon. The difference on flat Earth society appears that there is now an upward acceleration of the to explain gravity. So my question (don't know if this has been asked yet) is what is this system (Earth, dome) accelerating through? Sorry if this is already on here, I couldn't find it.