a few billion years from now. Astronomers say that while our Sun falls short of the critical mass to go nova, we're still doomed anyway (supposing we're still living on earth); as the Sun runs out of hydrogen fuel and starts to burn helium, its energy output will dramatically increase and it will expand into a red giant until it swallows up Mercury, Venus and possibily Earth, before it exhausts the helium fuel too and shrinks down into a white dwarf in its senescence. If there are any living creatures left on earth during the red giant phase, this is what they might see (I know, there wouldn't be any clouds then; but I had to work with what I had -- at least they add a little drama^^).
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