BREMEN, Germany — Balloons, airships, unmanned planes and other so-called pseudo satellites loitering in the stratosphere are likely to enrich the global communications and Earth-observation ecosystem in the not-so-distant future.

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Tereza Pultarova is a London-based science and technology journalist and video producer, covering European space developments for SpaceNews. A native of the Czech Republic, she has a bachelors degree in journalism from the Charles University, Prague,...