The geocache is tiny jar hanging on a pine tree. It is easier to reach going from the neighbourhood, not the trail. The geocache could fall easily so be sure to put it farther in on a branch.
A Dyson sphere is a hypothetical megastructure that completely encompasses a star and captures a large percentage of its solar power output. The concept is a thought experiment that attempts to explain how a spacefaring civilization would meet its energy requirements once those requirements exceed what can be generated from the home planet's resources alone. Because only a tiny fraction of a star's energy emissions reaches the surface of any orbiting planet, building structures encircling a star would enable a civilization to harvest far more energy.
- “Dyson Sphere.” Wikipedia, Wikimedia Foundation, 7 July 2022, https://en.wikipedia.org/wiki/Dyson_sphere.