How do astronomers use photodectors

[a.a]

Homework Statement

How do astronomers use photodectors on nasa's Hubble space telescope to produce galactic images?

Homework Equations

The Attempt at a Solution

I can't find any relevant resourses on the topic.. not on the internet either.

 

[Kurdt]

I think the HST just uses CCD's. You can check out how they work.

 

[mgb_phys]

The current instruments are here http://www.stsci.edu/hst/HST_overview/instruments
Most are CCDs, NICMOS uses a CMOS chip like the one in your digital camera and one of the earlier now repalced instruments FOC used an intensified TV tube.