The Achilles Heel by Raymond Z. Gallun:
Science Fiction Inventions, Technology and Ideas

Clever Gallun story still satisfies after all these years. A space bandit arrives unexpectedly on an observatory on Mercury and forces an elderly astronomer to trek across the blasted ash of the closest planet to the sun! How can the tables be turned? Found it in this copy of Amazing Stories, 1940. Select an invention:

Asbestos Sunshade

Atomic Blast Weapon

Paralyzing Gun

 

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