Donavyn Coffey from livescience said that Space is an almost perfect vacuum, full of cosmic voids. And in short, gravity is to blame. But to really understand the vacuum of our universe, we have to take a moment to understand what a vacuum really is — and what it’s not.
So, what is a vacuum, and why isn’t space a true vacuum?
First, forget the vacuum cleaner as an analogy to the vacuum of space, Jackie Faherty, a senior scientist in the Department of Astrophysics at the American Museum of Natural History in New York City, told Live Science.
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