This gave me an idea. I don't know if it is very good, but it is an idea.
Concentrated sunlight can make things very hot, very fast. Okay, let's concentrate sunlight onto a heat exchanger and use the hot gas as a reaction mass in a rocket. That is, to use the sun as an energy source instead of carrying one on-board a spacecraft.
The heat generated in this video is enough to make a respectable amount of thrust, if I am not mistaken. I understand that the amount of power isn't much in terms of its size. At any rate, it may be an interesting thing to contemplate.
Update:
This became an 18 part series, if you can believe that.
Here's the links in order with each number as a link: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18.
Looks like 11 is missing. Oops! So, that makes it a 17 part series instead.
Al Fin: "Cowboy Commentary", aka "Eat your veggies" The Flag banner is posted in order to defy those who would make patriotic symbols illegal or disreputable.
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