Nuclear space propulsion (virtual)

The US, Russia and China have ongoing projects for the development of space nuclear propulsion systems. Two of these projects target in space demonstration by 2030, one concerns a nuclear thermal propulsion engine, the other a space tug with nuclear electric propulsion.
What is the interest of nuclear thermal propulsion? of nuclear electric propulsion? For which applications / space missions ? How does it work ? How is it designed? What is the state of the art? What are the main technological challenges? What are the prospects? What about the safety? Those are the questions our speaker will address.
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