Source: Defense News
quote: the shockwave is what does the damage.
quote: With no matter getting in the way of this intense thermal wave, it would seem the light show would be far grander in space.
quote: Ground Zero of a nuclear blast instantly heats the surrounding area to 300,000,000 degrees C at the speed of light. No matter on earth or space would/can withstand that much thermal radiation and would be instantly vaporized.
quote: Argus III Time: 22:13 September 6, 1958 (GMT) Location: 48.5° South, 9.7° West Altitude: 335 miles (539 km) (perhaps the highest nuclear explosion ever)https://en.wikipedia.org/wiki/Operation_Argus
quote: U.S. Nuclear Weapon Tests, Operation Dominic; Nukes In Space!