Fun Iridium trivia: it was originally designed to need 77 satellites, hence the name. By the time they deployed they’d figured out they’d only need 66, but for some reason didn’t change their name to Dysprosium.
This kind of trivia can be discovered in the very interesting and entertaining book "Eccentric Orbits: The Iridium Story" by John Bloom. Highly recommended read (if you're generally into tech/business/startup chronicles)!
And while you're at it, read "Chip Wars" by Christopher R. Miller as well. Extremely good read to understand tomorrows' most relevant geopolitical conflict.
