The "flux capacitor" is actually a fictional device from the movie "Back to the Future." It is not a real scientific concept or technology. In the movie, the flux capacitor is depicted as a key component of the DeLorean time machine, allowing it to travel through time when combined with a plutonium-powered nuclear reactor.
In reality, time travel as depicted in science fiction is currently beyond our scientific understanding and technological capabilities. While there are theoretical concepts like wormholes, which are hypothetical shortcuts through spacetime, they remain purely speculative and have not been proven to exist or be practical for time travel.
As for why organizations like NASA or the Russian space agency have not attempted time travel, it is because it is purely fictional and not based on real scientific principles. The scientific community focuses on exploring and understanding the laws of physics within our current understanding, and time travel is not currently regarded as a viable concept within those laws.
It's worth noting that space agencies like NASA and Roscosmos primarily focus on space exploration, studying the universe, conducting experiments in microgravity, and advancing our knowledge of space and technology. Time travel is not part of their research agenda as it falls outside the realm of current scientific understanding.