Control rods come in all shapes, sizes and flavors to fit the needs and requirements of the different reactor designs.
Cruciform control rod which looks more like a blade, and is made by (GE), who is the supplier of Boiling water reactors, these blades are inserted from the bottom of the...
First thing allow me to say that only nuclear power can provide enough power to take us to planetary missions (like Jupiter), and back. These missions require 7 to 12 years of continues operation. Solar and chemical simply can not do it.
Now to your question of power-to-weight ratios for a 1 MW...