Interplanetary space flight or interplanetary travel is the journey with or without crew between stars and planets, usually within a single planetary system. In practice, space flights of this type are limited to traveling between the planets of the Solar System. So, great; we currently have interstellar space probes in operation. Except that the problem is that they're not going anywhere very fast.
Each of these intrepid interstellar explorers travels at tens of thousands of miles per hour, which sounds pretty fast. They are not heading in the direction of any particular star, because their missions were designed to explore planets within the solar system. But if any of these spaceships were to head to our closest neighbor, Proxima Centauri, just 4 light-years away, they would reach it in about 80,000 years. An orbit is a regular, repetitive trajectory that an object follows around another object or center of gravity.
Orbiting objects, which are called satellites, include planets, moons, asteroids, and artificial devices. Regardless of how it is achieved, a propulsion system that can produce continuous acceleration from departure to arrival would be the fastest method of travel. NASA has been researching interstellar travel since its creation, translating important articles into foreign languages and carrying out the first studies on the application of fusion propulsion, in the 1960s, and laser propulsion, in the 1970s, to interstellar travel. A theoretical idea to allow interstellar travel is to propel a starship by creating an artificial black hole and using a parabolic reflector to reflect its Hawking radiation.
The speeds required for interstellar travel in a human lifetime far exceed those that current methods of space travel can provide. For example, a spaceship could travel to a star 32 light-years away, accelerating initially at a constant speed of 1.03 g (that is, from the perspective of a planetary observer, the ship will appear to accelerate steadily at first, but then more gradually as it approaches the speed of light (which it cannot exceed). In addition, once travelers arrive at their destination (by any means), they will not be able to travel to the surface of the target world and establish a colony unless the atmosphere is not lethal. On the other hand, Andrew Kennedy has demonstrated that if you calculate the travel time to a given destination as the speed of travel due to growth increases (even from exponential growth), there is a clear minimum in the total time to that destination starting now.
Although these requirements are still well below the requirements for interstellar travel on human time scales, the study seems to represent a reasonable reference point with respect to what could be achieved in several decades, which is not impossible to overcome the current state of current technology. The universe would appear to have contracted in the direction of its journey to half the size it was when the ship was at rest; the distance between that star and the Sun appears to be 16 light-years, as measured by the astronaut. Since particles that travel at these speeds acquire more mass, it is believed that this change in mass could generate an acceleration. Light in a vacuum travels about 300,000 kilometers (186,000 miles) per second, so 1 light-year is equivalent to about 9,461 × 1012 kilometers (5,879 trillion miles) or 63,241 AU.
Humanity would have to overcome considerable technological and economic challenges to achieve interstellar travel with and without crew.
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