The idea that one person could accomplish all of those tasks some million times in a hour period seems a daunting challenge. In fact, innumerable parents of children who've ever believed in Santa Claus can provide testimonials as to what a challenge it is for even one household! But Santa is undaunted by the monumental task before him. With million households to visit and 42 hours to do it in, that means Santa has a total of just microseconds 0. Sound impossible?
Maybe for a normal human with conventional technology, sure. And if you accept science, you should have faith in Santa, too.
Let's take a look at each of the objections you may have. Many popular depictions of Santa don't involve him following the optimal path as determined by In fact, science tells us exactly how he'd make it happen! There's no way Santa could travel to each house that quickly. These speeds aren't so bad; compared to the vehicles we've designed, the speeds Santa needs aren't actually all that fast. At least, not compared to relativity and the speed of light.
To move that 0. Sure, that might seem awfully fast compared to your typical sleigh, or even your typical car, train or supersonic aircraft. If you fuel up those reindeer right, there's no reason to believe Santa can't make this house-to-house journey in record time.
Surely, traveling at incredibly large speeds with an open cockpit would be a devastating proposition But with the right technological advances applied, it just might be possible to fly to half-a-billion households in a single, crazy night without harming yourself at all. There's no way an open sleigh — and a Santa within — could handle the heat or acceleration generated.
First, there's the heat objection. Moving at those intense speeds, the frictional forces of the atmosphere alone could be a disaster; the only thing we're familiar with that collides with the atmosphere at those speed are meteors, and satellites that re-enter the atmosphere.
Santa would need to dissipate somewhere on the order of a few trillion Joules of heat each second of travel, which is a tremendous amount. Without any protection, you might expect Santa, soaring through the atmosphere at meteor-shower speeds, would burn up the way a satellite does during re-entry.
Astronaut Bob Crippen with the Gemini-B capsule, and the severely scarred and damaged but intact! It's very difficult to survive re-entry into an atmosphere at speeds even lower than what Santa Claus would likely encounter, but perhaps North Pole-level technology will give us exactly what we need. The accelerations are a little rougher, mind you. Going from 0-to miles-per-hour in a tenth of a second is a disaster for most people; you'd pass out or worse from the acceleration.
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