Nuclear launch details
- Yes
- No
- No (at least not till 2 seconds before the nuke lands)
- 300 (+200 vs. structures) damage in a large radius (though in the single player tosh does 700 + 500 vs structures
A nuke does 500 to buildings, 300 to units in the center. It decays as you go outward, as shown in this image from the Liquidpedia entry on Nukes.