To add on to that, in more serious proposals, the idea is to mass manufacture a lot of small satellites you could hold in your hand, attached to about a km or so of hyper thin foil. At obital velocity, any micrometeorites or other object will flash vaporize an equal sized hole on contact, and indeed this is how we do modern micrometeorite shielding for spacecraft today.
We just care about blocking a tiny fraction of relevant sunlight, holes don’t really effect the outcome compared to the negative space around the satellite.
The idea is less umbrella and more parasol. Tiny holes would be just fine.
To add on to that, in more serious proposals, the idea is to mass manufacture a lot of small satellites you could hold in your hand, attached to about a km or so of hyper thin foil. At obital velocity, any micrometeorites or other object will flash vaporize an equal sized hole on contact, and indeed this is how we do modern micrometeorite shielding for spacecraft today.
We just care about blocking a tiny fraction of relevant sunlight, holes don’t really effect the outcome compared to the negative space around the satellite.