Why haven't extraterrestrials made their presence known?

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the alcubierre drive isnt a wormhole,

but actually the wholer idea of the new improvement is to rotate the field to create something akin to a the looking glass of alice principle in black holes.
a donut shapen rotating energy field.
as far as i can see there would be no discernible phsyical pressure on the vessel when riding inside the bubble, there is a wake are both inside and outside where there would be immense pressures but ship geometry can account for most of it.

still requirtes a way to manipulate negative energy which we dont have

It has been shown that when the Alcubierre space-time bubble exceeds the speed of light, the resulting hawking radiation would produce such extreme temperatures that the the spaceship would be large enough to disintegrate the spaceship into a plasma of elementary particles as well as causing instability in the bubble itself. It is highly unlikely that negative energy exists whatsoever.

Very neat idea, but it will never work. The wormhole is really the only option and the way to stabilize them is using angular momentum.

One thing people are forgetting - light speed still takes FOREVER to get anywhere. Going double or even triple the speed of light would still be too goddamn slow to go anywhere of astronomical significance.

i do not think anyone is "forgetting" that. the notion of traveling with a linear velocity to a distant destination has long been ruled out by most people who are considering the matter of interstellar travel.

the current ideology (as far as i know (which is not very far)) is to warp the space plane we are on to reduce the distance that needs to be traveled.
if one had a ticker tape a quintillion miles long, then the idea is to warp the tape by bending it over so that the end is just inches away from the beginning, rather than hurtling at impossible speeds in a linear fashion to take trillions of years to get to the end.

in order to bring the destination close by, one would have to create a gravitational force that compresses all that spacial distance into a manageable short hop, and the energy required to do so is not found anywhere in the universe, let alone able to be harnessed.

even super massive black holes have not the influence required to compress an incomprehensible inter galactic distance into a distance that is able to be traversed by ordinary means. there is no energy source in the universe that can cramp the distances in question into the same location that one is already in.

worm holes are impossible. quantum relocation may be the best idea, but whoever is a test
subject to volunteer to take the "journey" would not be able to report whether it was successful unless they "came back" (they are millions of light years away), and that would not be possible because there is no apparatus to enable that return trip available at the destination.

who knows? (i am sure all of you do), but i believe that quantum entanglements of fundamental "pairs" of energy is the only way that one can travel outside time to impossible distances within time.
i have my helmet on.

With what? An angular momentum stabilizer that runs on unobtanium or nosuchthingium?

ruveyn

Handwavium. It will do anything you want it to, as long as you don't try to explain how it works.

you have a sprightly and humerus mind for a 76 year old.

My body only appears to be 76. Inside I am still the same 19 year old mad-man I was 57 years ago. To the mirror I say: "You lie, damn you!"

ruveyn

i have trouble believing you are 76, but i do not consider you to be dishonest. i have never seen a 76 year old person who can out think young people in immediate circumstances.

that is all i have to say and your ego should not prompt you to extend this conversation.

A Kerr black hole is a essentially a space-time tube whose boundary is maintained by a ring shaped singularity. And FYI such an object has been found: Sagittarius A*. I actually saw an article in the last year that astronomers have finally succeeded in imaging its event horizon, confirming that this object is indeed a black hole and the heart of it is a massive hole in space-time 11 million miles wide. What prevents Sagittarius A* from collapsing to a true singularity is its angular momentum. I have mentioned this in more than one thread you posted in. Despite theoretical predictions that Kerr black holes are too unstable to exist, the observational evidence suggests that objects with such properties really do exist. Schwarzschild black holes however, are theorized to exist and there are several objects believed to be Schwarzschild black holes, but the problem is that this has not yet been confirmed since astronomers have yet to observe an event horizon on such an object(which means that such objects may be compact neutron stars).

How do you propose we get to it? By using another "stable" black hole nearer to us.

Do not confuse outre physical effects with feasible tools.

ruveyn

My grandma is 76 and she uses the Internet all the time. I think people born in the 30's are a lot more modern than people born in the 20's.

Fo' Sho' - And people born in the 10's are a lot better at playing dead.

I think that we've not contacted extraterrestrials yet because the odds of it happening are really low.

We're probably not alone in the Universe. I would say that life is probably pretty common in the Universe, relatively speaking. Intelligent life would be rarer, though. For one thing, intelligence itself may not happen all that often. It requires a very specific evolutionary path to make an organism physically capable of intelligent behavior. Beyond that, alien intelligence might be, well, alien. It may not look like our intelligence at all, and they may or may not actually care about space travel.

In the case that a species with an intelligence similar enough to our own to care about space travel does evolve, it may not survive for that long, or its technological growth may flatten out at some point. It's unlikely that we would pick up random radio signals travelling across the gulf of space, and species like our own eventually shrink their radio profile, anyway. Assuming that they don't ever develop interstellar travel, they would never contact us physically. Interstellar travel is probably incredibly rare if it happens at all. The speed of light is an absolute maximum speed, and something that you can only reach with massless particles. Maybe there are ways to be sneaky and get around that (like the creation of a stable wormhole), but the odds that a species will attain them are probably very low. Even then, those means of transport probably remain extremely rare. Most interstellar species would probably never build an interstellar empire like you see in science fiction. They probably remain small-scale enough to be susceptible to factors which can cause extinction, too.

Those are the realistic reasons why we haven't encountered anyone else. I will say, though, that I'm really fascinated by another. That's the idea that the first species to get the ability for interstellar travel might purposefully wipe out others. Works really well for science fiction, although I highly doubt that it's the real reason.

If we expect most extraterrestrials to be carbon-based life forms, we might miss them.

IMO, the most visible of all extraterrestrials are the plasmatic orbs.