I think it's for dramatic effects, although scientifically incorrect.
Outer space, it was a remake of "The thing from outer space".
Possibly the cat in the movie,The Cat from Outer Space.
Enough to fill the outer-most shell. For most this is eight, but for helium it is two.
Moonraker
Killer clowns from outer space
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Yes, the movie E. T. is science fiction, since E. T. is an alien that comes from Outer Space, and outer space is considered science fiction.
Possibly, there is no real proof but there was a movie about it.
It wasn't a movie. It was the 1995 Outer Limit 2 part episode, called The Sandkings.
Bela Lugosi played a vampire in "Plan 9 from Outer Space" (1959). But he died before filming could be completed. His chiropractor was hired to replace him even though he was much taller than Bela. Scenes with the vampire holding his cape in front of his face feature the replacement. As a side note, "Plan 9 from Outer Space" is considered to be one of the worst films ever made.
The cat is a ruddy abyssinian
...no .the spores were from outer space if you are referring to "Day of the Triffids" movie.