Why haven't extraterrestrials made their presence known?

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I think it is plausible that Aliens have visited this planet in the past...


However considering we don't have Faster than Light Drives, they probably wouldn't contact us for that reason.

Invasion is highly impractical even with Faster than Light Drives, the mess that would be caused in the process would make it so it wouldn't be worth doing.

Cost vs. benefit takes invasion off the table, giving us faster than light drive would be like handing a car to a teenager that doesn't know how to drive, and so until we develop technology where they end up having to contact us (Faster than Light communications tech or Faster than light drive), they would have next to no reason to contact us.

Also they would rather us bump into them in the middle of space, than them land on our planet and we mistake it for an invasion.

There is not an iota of objective physical evidence to support that assertion.

ruveyn

I never said they did anything like went camping, as long as they didn't land or landed on hard rock, and didn't leave behind trash, there would be no physical evidence that would be detectable given we'd be looking for evidence that is a few hundred years old.

I am reluctant to believe anyone can move a massive body at or beyond light speed. I will believe it when I see it. In the mean time what you said was rank speculation and has no evidence whatever to support it.

ruveyn

'faster than light' isnt the only hypothesised way of moving from one part of the universe to another.

http://en.wikipedia.org/wiki/Wormhole

Scientists have put Warp Drive back on the table as scientificly plausible also.

The energy requirement for Alcubre's gravity warp wave exceed any energy source we can muster by at least ten orders of magnitude. Mathematically possible but practically infeasible.

There is not enough energy in the local cluster to make the thing work. And forget wormholes. They are unstable.

ruveyn

I would much rather have a 'wormhole generator'.

Even if faster than light is acheivable, it would still in likliehood take millions of years to reach anywhere of consequence.

Actually the estimated energy cost for warp drive has gone down substancially also, so it is theoretically feasible.

The temperature inside one of Alcubres gravity waves exceeds the temperature of the sun's corona. What shall we make our star ships out of. Do you know any construction material that can withstand 2 million degrees Kelvin? I don't.

So even if the Alcubre warp effect could be produced (how?) there is nothing that can make any use of it.

ruveyn

http://www.wrongplanet.net/forums-posti ... 21982.html

Considering NASA thinks it's capable of working, I think you are overestimating the requirements somewhat.

I'm just jumping in here and giving my take, since I think about these things alot. I do understand and believe in panspermia, technically some forms of bacteria can infact exist and stay alive in space. At one point or another, bacteria from our planet must have been blown to the moon, and Mars, perhaps further outward. One thing I know, everything is connected. I see the entire Universe is alive, just not sentient but ever-changing and evolving. Continually creating, and destroying. I feel that, we are comprised of some form of alien bacteria/non Earth, but perhaps emerged someplace else in our solar system or galaxy, and made home on Earth. I don't feel space ships visit Earth, or anything like that. Perhaps centuries ago, although it's unlikely without proof. Also I feel that the Universe is like a computer with our consciousness substantiated into it. Our brains are at best - used for information processing. Everything is frequencies that we decode into photons, constructing into solid matter but nothing truly is solid but merely vibrational atoms.

If the technology could get them here,then it would be able to conceal them also.They would just examine us as we examine life forms that we think are more primitive than us.Some where in the galaxy little aliens are watching their version of National Geographic only it's called National Galactic and they really enjoy the primitive antics of the primate species on planet 4892322.

In that case, what the hell was this thing and where did it come from?

If it is a terrestrial craft, please cite your sources as to who built it.

First of all, the Alcubierre drive requires the use of negative energy to which there is no evidence for.


The only way a warp drive can work is a VERY high powered gravitational amplifier. But in order for the spaceship to prevent being crushed into oblivion and then evaporating in a burst of gamma rays, it would need to rotate extremely rapidly and build up enough angular momentum to protect itself from the immense gravitational forces being generated. THAT is how you would create a stable wormhole.