Why not just shoot a $4 roll of film, and scan it on a $200 flatbed scanner at a mere 2400DPI for a fat 30 megapixel image...
Because film doesn't have infinite resolution. You can only fit so many of those silver halide crystals on a bit of film, and that limits how much "data" can be stored in the frame. 35 millimeter film at normal ISOs (aka that $4 roll you mentioned) can't really be printed larger than 8"x10" unless you have an artistic attraction to extreme graininess.
The Visible Universe probably constitutes a very small (perhaps even infinitesimally small) fraction of the actual physical Universe. The rest will, according to Relativity, always be hidden.
Or it may be that the visible universe is smaller than the actual universe. This paper estimates the minimum possible diameter of the universe to be 24 gigaparsecs, which is four gigaparsecs less than the diameter of the observable universe. It's not likely, but if it were true it would mean we could look a billion lightyears in one direction and see a region of space, or we could look 77 billion lightyears in the opposite direction and see how that same region looked 76 billion years earlier, by seeing light the looped around the long way around the universe.
If someone is trying to open my front door with a crowbar, someone else might get suspicious.
You should read about lock bumping. Pin tumbler locks (ie ordinary door locks) can be opened in seconds by any unskilled thief using a bump key. There are videos on youtube if you're interested.
trying to keep it in the bathtub without telling your wife probably isn't going to turn out well...
Unless you're into that kind of thing, in which case it'll turn out great!
Terminal velocity is the speed a thing is going when the force of gravity pulling down is equal to the force of drag pushing up (0 net force = no acceleration, ie constant velocity). The force due to drag at high altitudes is very low because there's not much air that high, which means there's not much to keep gravity from accelerating the sky diver. As he descends and the air gets thicker he will decelerate back to subsonic speeds because terminal velocity is lower at lower altitudes (all else being constant).
A common myth related to terminal velocity is that terminal velocity is a constant rate that all objects fall at. That's not true because drag factors into terminal velocity and different things are more or less aerodynamic. A person skydiving spread-eagle falls slower than a person diving streamlined, and a bullet will fall back down at about the same speed it was going when it was fired.
Kleeneness is next to Godelness.