# XXI: The Power of the Thought explained — Invaders from the Infinite > Chapter companion for Invaders from the Infinite by John W. Campbell. ## What happens Arcot demonstrates the immense power of the Thought by stopping a Thessian planet in its orbit, turning it into a miniature sun, and then racing across the universe to Talso, where a desperate battle against the Thessians is underway. ## Themes in this chapter ### The Nature of Power and Responsibility Arcot's ability to destroy a planet with the Thought raises questions about the ethical use of ultimate power. ### Technological Progress and Its Consequences The Thought's technology enables feats like stopping a world, but also leads to massive destruction and panic. ### Unity Against a Common Enemy The Talso forces and their allies unite to resist the Thessian invasion, though their defenses ultimately fail. ## Character check-ins ### Arcot Uses the Thought to stop a planet and later pilots the ship at incredible speed to Talso. ### Morey Calculates the kinetic energy conversion and observes Arcot's demonstration. ### The Thessians Their planet is destroyed; they flee the system and continue attacking Talso. ### Thett Leads the Thessian forces in the battle at Talso, using advanced tactics and rays. ### Taj Lamor Mentioned as part of the Talso defense forces. ## Key lines > “The thought idea in their minds has always been a single world, single solar system as their home, however.” “And single solar systems cannot originate in this Space,” replied Morey, referring to the fact that in the primeval gas from which all matter in this Universe and all others came, no condensation of mass less than thousands of millions of times that of a sun could form and continue. Arcot notes that the Thessians think only in terms of single worlds or systems, but Morey points out that such small condensations couldn't form from the original cosmic gas. _Highlights the cosmological scale of the conflict and the limitations of Thessian perspective._ > “Excellent, my dear Watson,” replied Arcot. “And now does my dear friend know the average molecular velocity of ordinary air?” “Why, about one-third of a mile a second, average.” “And if that planet as a whole should stop moving, and the individual molecules be given the entire energy, what would their average velocity be? And what temperature would that represent?” asked Arcot. Arcot, playing detective, asks Morey to calculate the temperature if a planet's orbital kinetic energy were converted into molecular motion. _Demonstrates Arcot's methodical and theatrical approach to problem-solving._ > But the men were not watching the meter; they were watching the awesome sight of Man stopping a world in its course! Turning a world from its path! The crew is awestruck by the spectacle of humanity halting a planet's motion. _Emphasizes the sublime and terrifying power of the Thought._ > It was silent, as a world pitted its enormous kinetic energy against the combined forces of a universe. Soundless—and as hopeless. The collision between the planet and the energy wall is utterly silent, and the planet's energy is insignificant compared to the universe's forces. _Conveys the futility of the Thessian planet's resistance._ > And from every planet of the system was pouring an assorted stream of ships, great and small, and they all set panic-stricken across the void in the same direction. They had seen the power of the Thought , and did not contest any longer its right to this system. All Thessian ships flee the system in panic after witnessing the Thought's power, conceding defeat. _Shows the psychological impact of Arcot's demonstration._ ## Links - HTML: https://www.betterreads.online/discover/invaders_from_the_infinite_se/chapters/xxi-the-power-of-the-thought - Book: https://www.betterreads.online/discover/invaders_from_the_infinite_se - All chapters: https://www.betterreads.online/discover/invaders_from_the_infinite_se/chapters