This transition from petty grievance to existential dread is classic Sheldon Cooper. It demonstrates his inability to regulate the scale of his emotions—if he cannot win a middle school science fair, he might as well focus on the inevitable destruction of the Earth. The Conflict: Quitting Science
The "Oklahoma" portion of the title refers to a job offer George Sr. receives to coach college football in Tulsa. This subplot acts as the grounded counterweight to Sheldon’s cosmic worries. While Sheldon fears the end of the world, Mary and George grapple with the potential end of their life in Medford.
"Killer Asteroids, Oklahoma, and a Frizzy Hair Machine" is an essential episode because it humanizes Sheldon. It moves beyond his "annoying genius" trope to show a child genuinely terrified by the vastness of the universe and the unfairness of life. By the end, we see that while Sheldon might be focused on the stars, it is his family that keeps his feet on the ground.