It is the main light-gathering component, the main mirror of a reflector or the object-lens for a refractor. That determines the power of the telescope to gather light from dim objects and provide a clear image.
Yes the CPU (aka microprocessor or Central Processing Unit) is the most important, but it is not necessarily the most expensive.
The single most expensive component of a system built from separate components is generally the processor.
The single most expensive component of a system built from separate components is generally the processor.
the diameter of the eyepiece, the diameter of the objective, the focal length of the eyepiece or the number of mirrors used to form the image?
coordination is the most important component
correctness
Collagen fibres.
bones
Leads
My family, personally, is most important to me.
The most important component is piperine.
You are the most important