3 ms·
The original PCU was replaced in 2001. https://esahubble.org/about/history/sm3b_replacement_of_pcu/ https://esahubble.org/about/history/sm3b_replacement_of_pcu
by phonon 5y ago
The original PCU was replaced in 2001.
https://esahubble.org/about/history/sm3b_replacement_of_pcu/ https://esahubble.org/about/history/sm3b_replacement_of_pcu/