2023-8-25 Isotopes in Nuclear Fusion

As far as scientific correctness is concerned, when Rex helps Brad build a miniature fusion reactor, the isotopes involved are Deuterium and Tritium. The same article below explains where Deuterium is found, and the one below it explains where Tritium is found, which coincides with the scene of Rex floating in space.

https://www.energy.gov/science/doe-explainsdeuterium-tritium-fusion-reactor-fuel

https://www.epa.gov/radiation/radionuclide-basics-tritium#:~:text=Tritium%20is%20produced%20naturally%20in,a%20byproduct%20in%20nuclear%20reactors.