"harness the power of a star"
https://mkaku.org/home/articles/the-physics-of-time-travel/
"the continuous flow of charged particles from the sun, a stream known as the solar wind.
This wind consists primarily of protons, the positively charged nuclei of hydrogen atoms."
https://www.space.com/24422-solar-wind-makes-water-star-dust.html
"Thermonuclear bombs, better known as hydrogen bombs, are the single most destructive weapon ever created by the human race. Powered by a combination of nuclear fission and nuclear fusion – the same process the sun uses to generate energy"
https://sciencing.com/effects-hydrogen-bomb-5399698.html
"After months of careful checks and tests, the number they found was 0.127 particles per cubic centimeter, or about 120 hydrogen atoms in a space the size of a quart of milk.
This result confirmed a 2001 study which used Voyager 2 – about 4 billion miles away – to measure how much the solar wind had slowed by the time it arrived at the spacecraft. The slowdown, largely due to intervening interstellar medium particles, suggested a matching interstellar hydrogen density, about 120 hydrogen atoms in a quart-sized space.
But newer studies converged around a different number. Scientists using data from NASA’s Ulysses mission, from a distance slightly closer to the Sun than Jupiter, measured pickup ions and estimated a density of about 85 hydrogen atoms in a quart of space. A few years later, a different study combining Ulysses and Voyager data found a similar result."
https://www.nasa.gov/feature/goddard/2020/new-evidence-our-neighborhood-in-space-is-stuffed-with-hydrogen
"Nuclear thermal propulsion is one technology that can provide high thrust"
https://www.nasa.gov/mission_pages/tdm/nuclear-thermal-propulsion/index.html