Hubble construction

  • #1
I did a cursory search on the forum, and I browsed Wiki.....but maybe I missed it.
What is that big Flap/Door on the end of the scope.?
Is it part of the optics, or is it a protection device, or a.....?
Thank You
 

Answers and Replies

  • #2
Bandersnatch
Science Advisor
3,143
2,245
It's the aperture door. It closes to protect the optics from sunlight.

Read more here:
asd.gsfc.nasa.gov/archive/sm3a/downloads/sm3a_media_guide/HST-systems.pdf
 
  • #3
10-4
Thank You.....
 

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