Satellites come in all shapes and sizes, from the 6.2-ton James Webb Space Telescope with its 21-foot-diameter mirror and sunshade the size of a tennis court (fully extended), all the way down to tiny cube-sats that measure just a few inches on a side. So too, the rockets that launch them.Some are big, such as SpaceX's Falcon Heavy. And others are quite small, such as Rocket Lab's (RKLB -1.35%) Electron -- which makes perfect sense. You don't need a giant megarocket to launch some of the smaller satellites ...