hi may I offer more cool space science? er, this one is more quantum mechanics than precisely space, but still cool science. there's this thing called the Heisenberg uncertainty principle, which is basically that when it comes to quantum particles, there are some characteristics, ie position and momentum or energy and time, that are linked so that the more you know about one characteristic the less you know about the other. so, the more you know about where a particle is the less you know about its momentum and vice versa; the more you know about how energetic a particle is the less you know about when it has that energy and vice versa.
but wait, what about in a vacuum? if you've got a box in a vacuum, you know the position of everything inside that box, and if it's a vacuum then everything inside it has no momentum, except hang on that violates the position-momentum uncertainty because now you know both the position and momentum of particles in this box. so, instead, in the case of a vacuum, energy-time uncertainty applies - on tiny time scales, particles constantly blink in and out of existence, so you never know how much energy is inside your box of vacuum. but all of this applies on a larger scale and even to the vacuum of space! so a vacuum isn't actually perfectly empty, but rather constantly seething with particles and energy on a quantum level. it's called zero-point energy and it actually more or less doesn't really affect anything classically, unless you're a scientist trying to perform an extremely precise and calculated experiment that could be disrupted by it, in which case you need to account for it. it's also been legitimately observed as long ago as 1996 (by Steven Lamoreaux, in case you want to do more reading on that experiment), which is pretty damn cool for something that admittedly, like most of quantum physics, sounds entirely made up! :D
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