random childhood memory

Here's a random childhood memory I just had during the previous minute:

It is that of a certain Astro Boy feature movie (I wasn't sure if it's related to the series - and I'm not in the mood of googling), where the characters are in despair in front of a toxic "cloud" (my first interpretation of a black hole) roaming in space, and which suddenly decided to take over Earth. Eventually the Earth was saved, but then, morbid thought, what would happen if some unknown hidden astrophysical event was to destroy the Earth in the next hour, or the next minute? (Or what if, before I can even save this entry, I'm decapitated by a meteor?!)

(So much speculation. And just a slice of late night musings...)