may be sufficient to support a fusion chain reaction, if sufficient energy can be delivered to ignite the reaction. If a gas giant has a layer with a large concentration of deuterium (>0.3%), ultra-high-speed collision of a sufficiently large asteroid (diameter > ) could ignite a thermonuclear reaction.

Examples in fiction

*In Arthur C. Clarke's 2010: Odyssey Two, an alien construct transforms the hydrogen of Jupiter's atmosphere directly

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