As such, faster-than-light travel is currently considered impossible.
Perpetual motion machines: A machine that generates more energy than it consumes and operates indefinitely without an external energy source goes against the principles of thermodynamics, which dictate the conservation of energy.
Time travel to the past: Time travel to the past is currently regarded as implausible due to various paradoxes, such as the grandfather paradox, which creates logical inconsistencies.
Violation of the conservation of mass and energy: The law of conservation of mass and energy is a fundamental principle in physics, stating that the total amount of mass and energy in a closed system remains constant over time.
Communication beyond the observable universe: The universe has an observable limit due to the finite speed of light. Therefore, direct communication with objects or beings beyond this observable horizon is not currently feasible.
Finding a perfect random number generator: True randomness is challenging to achieve in computing and is subject to limitations imposed by the underlying hardware and algorithms.
Creation of a perpetual motion economic system: An economy that continuously grows without any cyclical fluctuations or limitations is considered unattainable due to various economic factors, resource constraints, and market dynamics.
Achieving absolute zero temperature: Absolute zero (0 Kelvin or -273.15 degrees Celsius) is the lowest theoretically attainable temperature. Cooling an object to absolute zero would require extracting an infinite amount of energy.
While these events are deemed highly unlikely or impossible based on our current understanding of the world, scientific knowledge and technological advancements can evolve, and some of these things may change in the future. It's always essential to remain open to new discoveries and possibilities.