Yes, an observer accelerating at one g can travel across the galaxy in a lifetime if one has unlimited access to power which likely demands a wormhole. so What? Back on earth ,we have to live 26,000 years in order to get a report.
I have posted that near light speed travel applies to nearby star systems and this appears to be supported by conforming evidence from the UFO Phenom.
we can leave our local sphere, shed mass and travel at around half c to any nearby star system. this would give us direct contact access to nearby alien societies. Inasmuch as the plausible scale of such an operatiion is mapped inversly by the UFO data, it is plausible. The aliens are doing exactly what we will be doing.
We now understand two defined spatual bubbles. Near star intelligent contact transfering information is one. The other is defined as the sublight creation bubble which may not be an order of magnitude larger than our Galaxy and naturally presuming that every galaxy we see is an image of our galaxy at different times.
A Decade-Long Voyage Through the Milky-Way is Possible Without a Wormhole Shortcut
https://avi-loeb.medium.com/a-decade-long-voyage-through-the-milky-way-is-possible-without-a-wormhole-shortcut-c9f3d937638d
A map of the Milky-Way galaxy with the Sun 26,000 light years below the Galactic center. (Image Credit: BlueBucketMaple)
Unlike societal laws, it is impossible to break the laws of physics. The distance of the Sun from the center of the Milky-Way is about 26,000 light years, implying that a spacecraft would require at least 26 millennia to cross it, given that the speed limit on the interstellar highway is the speed of light.
Since 1935, when Albert Einstein and Nathan Rosen proposed here that a spacetime bridge could link two separate regions of space, it became fashionable to ask whether a spacetime wormhole of this type could be traversed by a traveler. As of now, wormholes are not known to be traversable and remain purely hypothetical. For known materials, they pinch closed too quickly for even light to pass through. To prevent immediate collapse, a wormhole must be stabilized by a substance with a negative mass. This negative mass exerts gravitational repulsion that acts as a scaffold. The entry of a traveler adds a positive mass that tends to trigger a catastrophic collapse of a wormhole. Furthermore, gravitational tidal forces inside a normal wormhole would be severe enough to tear a traveler apart. To date, no experimental evidence or astronomical observation has ever confirmed that wormholes exist in our universe, let alone that they can be used for spacetime travel.
Does this mean that Galactic trips are impossible over a human lifespan? Not at all.
Let us start from a practical consideration. In a low-gravity space environment, astronauts lose about 1–2% of their bone mineral density per month (as reported here). This implies that humans cannot survive a low-gravity trip that lasts more than a decade. The simplest way to mitigate this health risk is by generating artificial gravity through acceleration of the spacecraft that carries the astronauts at the value equal to the Earth’s surface gravity of 1g= 9.81 meters per second squared.
A spacecraft accelerating at 1g will reach the speed of light in about a year. If it continues to accelerate at 1g for half of the trip and then decelerates at 1g for the second half, it would reach a distance of 26,000 light years within 19.8 years (roughly two decades) in the traveler’s frame, while 26,000 years elapse in the frame of Earth. If, however, the traveler is not interested in decelerating, the trip to the Galactic center will only take 10.6 years, roughly a decade.
Hence, a pleasant 1g trip — which would feel to a human just like staying still on the surface of Earth, can take place on a human lifespan throughout the Milky-Way galaxy.
As you might have guessed, there is a rub. Interstellar travel agencies will likely charge a huge fee for such a journey because of its energy cost. An acceleration all the whole way to the Galactic center requires an energy that is 55,000 larger than the rest-mass equivalent of the payload. For a human with a body mass of 150 kilogram, the required energy amounts to 3.2 gigatons of TNT, comparable to the total energy stored in the global nuclear arsenal on Earth today. For the acceleration-deceleration trip option, the required energy is 13,450 times larger than this. On top of these numbers, one needs to account for the limited efficiency of the propulsion engine and the need to bring the fuel to the rest frame of the spacecraft. Health insurance companies for interstellar travel will also need to worry about the fact that cold interstellar protons appear as energetic cosmic-rays in the frame of the spacecraft, triggering additional health hazards as they generate particle showers from the spacecraft walls.
However, if space engineers ever have access to a negative mass that is equal in magnitude to the payload mass, then the energy-cost of the trip can be close to zero because no energy is required to accelerate a system with a zero total mass up to the speed of light.
When evaluating the feasibility of such trips, we must adopt a sense of cosmic modesty. Elon Musk is probably not the most accomplished space entrepreneur that existed since the Big Bang, 13.8 billion years ago. In our first encounter with interstellar travelers, we can ask them for path length and duration of their journey. These two numbers would immediately educate us whether they solved the engineering challenges facing a decade-long travel of a spacecraft with a positive mass through the Milky-Way. Otherwise, they might have mastered the production of a negative mass.
No comments:
Post a Comment