Kelly Lepo - @kellylepo@astrodon.social on X: "The diffraction spikes we see in Hubble images are mostly caused by the struts holding up the secondary mirror. Here we see a model of the
![Aperture door discovery hst hubble space telescope sts 82 hi-res stock photography and images - Alamy Aperture door discovery hst hubble space telescope sts 82 hi-res stock photography and images - Alamy](https://c8.alamy.com/comp/GE4G87/orbiter-discovery-performs-a-flyaround-of-the-hubble-space-telescope-GE4G87.jpg)
Aperture door discovery hst hubble space telescope sts 82 hi-res stock photography and images - Alamy
![X \ Hubble على X: "#Now in 2009, Hubble's aperture door opens, once again allowing light from the universe to enter the telescope. #SM4live https://t.co/UgM4rXVz91 https://t.co/3AqiWjQ8hn" X \ Hubble على X: "#Now in 2009, Hubble's aperture door opens, once again allowing light from the universe to enter the telescope. #SM4live https://t.co/UgM4rXVz91 https://t.co/3AqiWjQ8hn"](https://pbs.twimg.com/media/D67h7bHXoAAwsVF.jpg)