When the Hubble Space Telescope was built in the 1970s and ‘80s, the mirror was assembled and ground well below Arizona Stadium, in Tucson. We don’t know how far below but you have to imagine that to construct precisely built very large mirrors you’d have to eliminate vibratons from above (which might not be that hard now since Arizona football has been on an epic losing streak of 20 games which it finally broke Saturday but partly because Covid and other problems limited Cal to just 42 players. Four coaches were also positive despite the team having a vaccination rate of 99 percent).