What about Holograms?
Your statements are correct within the bounds of the current understanding of the laws of physics as humanity knows them. Science, however, rolls forward in its understanding. It is hard to say what the laws of physics will look like in the distant future.Time Travel from the Present to the Past is impossible.
Time itself is moving forward and doesn't move backwards.
You are ALREADY a time traveler: You're moving from the present towards the immediate future.
The law of causality states that: "what has happened, has happened and couldn't have happened any other way".
We already have it - Lucid Dreaming. http://en.wikipedia.org/wiki/Lucid_dreamFlying cars score that high but fully AR/VR rooms not?
"Time keeps on slipping, slipping into the future." The Steve Miller band knew this long ago.Holograms already exist.
The problem is that holograms require a spinning mirror or some other medium to help refract light.
Holograms in Sci Fi never include the spinning mirror portion (ala Star Wars).
No idea where you've got the figure from to 'vaporize' a human being, but 3 GJ isn't all that much energy. The Grand Coulee dam could generate that in a little under two and half seconds, for example.3 Billion Joules (Gigajoules) to vaporize someone.
Therefore, it would require at least 3 Billion Joules to rematerialize them.
ERBs are pretty much non-traversable. Have a read of this paper for examples of traversable (particles and at the end of the paper, humans) wormholes. Note the figures for the minimum size of the wormhole's diameter and length of it to be passable by humans: 15,000 km and 3000 light years respectively. In other words, bigger than the Earth and no journey shorter than 3 kly either. Oh and the energy requirements for generating the two wormholes in the first place...What we really want is a wormhole technology or portal that allows you to connect two points in space and move instantaneously from one to the the next. "Einstein-Rosen bridge" (wormhole).
Time Travel from the Present to the Past is impossible.
Time itself is moving forward and doesn't move backwards.
You are ALREADY a time traveler: You're moving from the present towards the immediate future.
The law of causality states that: "what has happened, has happened and couldn't have happened any other way".
No idea where you've got the figure from to 'vaporize' a human being, but 3 GJ isn't all that much energy. The Grand Coulee dam could generate that in a little under two and half seconds, for example.
ERBs are pretty much non-traversable. Have a read of this paper for examples of traversable (particles and at the end of the paper, humans) wormholes. Note the figures for the minimum size of the wormhole's diameter and length of it to be passable by humans: 15,000 km and 3000 light years respectively. In other words, bigger than the Earth and no journey shorter than 3 kly either. Oh and the energy requirements for generating the two wormholes in the first place...
Just like saying time-travel is impossible?For any theoretical physicist to claim Wormholes aren't traversable is beyond laughable.
They can't even study Black holes yet.
Just like saying time-travel is impossible?
Going straight to the invisibility cloak! - You just need to look at how wildlife can blend into thier surroundsings to know that you dont need to be completely invisible. You just need enough of the body to be broken up to make it difficult for the eye to see. At least when stationary.
An infra red sensor would immediately see an invisibility cloak.
You can’t hide the heat of a human body or the machines working to cover it up.
Moving is a different matter as eyes are extremely good at detecting any kind of movement, but if you are not actually looking for invisible things you are unlikely to find them!
IR is simply a longer wavelength EM radiation than visible light. What makes you think that if someone were to come up with a working invisibility cloak, that longer-wavelength EM radiation would not be as easily redirected as visible light?An infra red sensor would immediately see an invisibility cloak.
You can’t hide the heat of a human body or the machines working to cover it up.
Moving is a different matter as eyes are extremely good at detecting any kind of movement, but if you are not actually looking for invisible things you are unlikely to find them!
We could probably do that now. However, like cyclamates, (which actually tasted like real sugar), fat-less butter would likely cause some form of cancer.Fat free real butter?