ok, sorry if i sound daft, but this one has been keeping me awake and i need a better physics brain to tell me why this is b'locks So, there was a recent study in aus that said Aliens don't exist, or rather that we can't find any evidence, because the conditions for life to evolve require, essentially, long periods of stability in which the evolving organisms regulate the atmosphere to be conducive to further evolution, and the odds of this are really long. i don't think that's the case.however. this got me thinking. Space and time are both sides of the same coin right. the curvature of space time is dependent on the mass of the objects in the firmament. is that right? the greater the density of matter in a particular area then the greater the time dilation? so areas that have more mass, like the central zones of galaxies, would have more curvature, both specifically on planets in that area and also generally in the whole zone, hence time would, for any being living there, be experienced at a different rate, more mass more speed or less mass less speed? is that right? perhaps because we exist in a particular 'zone' or 'band' or area of space time density what we are able to perceive is limited by that density, i.e. we can't perceive the faster or slower zones and they can't perceive us. consider a fly, it experiences time so fast that as we try to swat it it can easily dodge cos we are lumbering super slow giants to them. perhaps alien cultures are happening, either so fast or so slow relative to ourselves that we simply can't experience them. bonkers? possibly. what do you think?