Mackfly writes:

That is why the GLIDER altitude record is just a tad under 50,000 feet.
Never got over 18,300 feet myself.

It's conceivable that a glider could fly at just about any altitude that
can be attained by dust or other solid matter, if the glider were
ideally constructed. The higher the altitude, the more difficult it is
to construct such a glider, though. I can easily understand a glider
with a higher ceiling than a powered aircraft, simply because the lack
of a power plant greatly reduces the weight of the aircraft.

Still, 50,000 feet is very impressive!

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