A dark nebula is a cloud of cosmic dust so thick that light can't penetrate it. There are actual patches in the sky that appear totally black, even to the most powerful telescopes. This is not because they are empty, but because the stars can't be seen behind the dark nebula cloud.
The problem with a dark nebula is that we could theoretically pass through one, which could cause all kinds of wild shit to happen. The sun could be totally blocked out, in which case we're suddenly a giant ball of ice, the dust itself could cause havoc, choking the atmosphere and plunging us into another ice age, or the ozone layer might get shredded. There are lots of different ways a dark nebula can be a dick.
It's even been theorized that this happened before, and may be a cause of some of those extinction events I mentioned earlier. So, yes, we could end up being finished off by the universe dumping its version of a cat-litter box onto us.
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How will the world end?
General FictionLots of people had ideas that the world would never end, but now there's a book that gives crazy yet true ideas that could happen in 1.75bn Years! This has a lot of scientific words in it, so if your not a science wiz then I say go grab a dictionary!
