How relevant is perpetual motion, and atomic energy regarding space travel?

Any other scientific, odd facts and fantasy to share?How relevant is perpetual motion, and atomic energy regarding space travel?Perpetual motion is the theory which states that an object once set into motion will remain in motion until another force acts upon that object. Unless an object is in an infinite vacuum, however, perpetual motion is impossible. Even in space, the gravitational pull of the sun is sufficient to prevent most satelites from leaving this solar system. The idea that perpetual motion is an overall myth is the generalization that such an concept could exist on earth, despite the atmospheric friction and gravity of the earth itself.



Atomic energy is massive when released, as Hiroshima and Nagasaki have witnessed, but for the most part, it is a close range relationship of extremely powerful attraction found in atoms, (hence, atomic energy). Many people agree that the use of atomic energy in space craft is unrealistic, at the current time, because a nuclear reactor is too heavy and bulky to lift into orbit. However, Ben Bova's "The Precipice," shows how atomic energy may be used in space travel.



Have you heard about the use of nano aluminum in rocket fuel? Suppousedly, after reducing the size of aluminum alloy to a certain point, it becomes explosive.How relevant is perpetual motion, and atomic energy regarding space travel?Both are part of physics, and therefore will play a part in anything using physics, including space travel.



Perpetual motion (especially if it produces useful work) is not possible. This is part of thermodynamics, one of the most basic sciences.How relevant is perpetual motion, and atomic energy regarding space travel?There's no such thing as perpetual motion.



All probes of the outer solar system are powered by atomic energy.