OBS Chapter 2247 Security Attendance, refreshed in half an hour!!!
Chapter 2247 Security Attendance, refreshed in half an hour!!!
Chapter 2247 Security Attendance, refreshed in half an hour!!!
The Rainbow Bridge is naturally strong, but it is definitely not invincible. Otherwise, Odin would not have repented back then... After all, it was because he had seen the vastness of the universe that Odin was able to calm down and think about his gains and losses.
For example, now, Heimdall has failed.
In the entire Asgard, there are currently three people who have the highest authority over the Rainbow Bridge.
They are Odin, Thor and Heimdall.
Odin, not to mention, has the highest authority over the Rainbow Bridge. And the Spear of Eternity is the key to the Rainbow Bridge.
The second is Thor. He is now authorized by Odin to use the Spear of Eternity. However, as long as Odin is not dead, the Spear of Eternity cannot completely belong to Thor. All artifacts have their own consciousness. Only when Odin disappears completely will the Spear of Eternity recognize its master again.
The other one is Heimdall.
In fact, strictly speaking, Heimdall's authority is higher than Thor's. If Thor did not have the Spear of Eternity, he would have to call Heimdall when he wanted to use the Rainbow Bridge.
But even so, Heimdall still couldn't find Sif.
This is not normal, but also normal.
It's normal because if you don't have this ability, who the hell would have the audacity to kidnap people from Asgard? Wouldn't that be courting death?
Asgard has been in the universe for so many years, and has never encountered such a thing. As long as someone dares to kidnap their people, Asgard can directly locate them through the Rainbow Bridge in the next second, and then a large group of muscular brothers will rush into the enemy's lair! Even if you want to use this feature to ambush Asgard, you can't do it.
After all, they could use the Rainbow Bridge not only for reconnaissance, but also to retreat at any time.
So even though Asgard doesn't have a big fleet, its mobility is almost the best in the universe. (Of course, it can't be compared with the super-standard Celestials and Observers, each of which is more outrageous than the other. For example, the Celestials can teleport to any place in the universe by themselves, without having to use any other messy things. The technology of the Observers is more fantastic than magic. These guys can even travel through parallel universes and run around everywhere, which is even more outrageous than the mobility of the Celestials.)
So without the ability, no one would dare to do such a thing.
It's abnormal because there are people who can do this, and there are even quite a few. At least the Asgardians can't use the Rainbow Bridge to find the Observers or the Celestials... In fact, up to now, Thor is the only Asgardian who has really seen half of the Celestials... The reason why it's half is because Thor has never seen the real thing. Each of these people is a well-known big shot, who the hell is so idle to kidnap a little girl?
Well, that's a matter of perception.
In front of Heimdall, Sif is indeed just an ignorant little girl, although this little girl has killed at least thousands of enemies with her own hands.
But as a brother, no matter how old his sister is, when he looks at her, he always feels that she is an immature, annoying, yet cute little thing.
"I can't find her..."
The faces of the others also turned grim.
What Heimdall can think of, others can easily think of as well.
There are people who can do this, and there are even quite a few. But if they really want to deal with Asgard, they really don't need such despicable means.
For example, the Celestials, if they really want to deal with Asgard, they will just come and kill us.
With the little knowledge Thor has about the Celestials now, he knows very well that, at least for now, facing the complete Celestials, the best outcome for Asgard is for the entire clan to run as far as they can and not think too much about anything else.
But now this weird thing has really happened.
"Could it be the remnants of the dark elves?" Someone raised this possibility.
Many people nodded in agreement.
The Dark Elves are considered Asgard's strongest enemy, and this race is extremely troublesome.
Whether it was their stealth technology or their invincible black hole bomb, they caused Asgard to suffer a lot in the past.
The Dark Elves really restrain Asgard in a sense.
The first is their stealth technology.
In fact, many civilizations in the universe will develop stealth technology, but only a few can really excel in it!
The reason why we can see matter is that our eyes can see the light from objects, such as the sun, fire, lamps, etc. Different colors are due to the different ratios of the intensity of light of different wavelengths. For non-luminous opaque objects, it is the reflection of the irradiated light. If there is absorption of light and the absorption of different wavelengths is different, different colors will appear; for transparent objects, because of the different refractive index from air, reflection and refraction will occur at the interface, and the reflected light or refracted transmitted light can be seen and found to be different from the background. For example, the refractive index of air is about 1, water is about 1.33, and ordinary glass is 1.5. Glass in the air is easier to find, but it is more difficult in water. If it is in a solution with a refractive index close to that of glass, it cannot be seen.
Therefore, there are two conditions for invisibility: one is to be completely transparent, and the other is to have the same or similar refractive index as the surrounding medium. If, as described in science fiction, these two conditions are achieved through some special method, invisibility is achieved. Then, what can the invisible person see?
The eyes sense light because the photosensitive pigments in the photoreceptor cells on the retina absorb the corresponding light and undergo chemical changes, generating electrical signals to stimulate the optic nerve, which are transmitted to the brain to produce light perception. If the invisible person is completely transparent, he cannot absorb light and cannot sense light, so he cannot see light. Is it feasible to absorb only a small amount of light without affecting the invisibility effect? It still cannot work, because the eyes not only sense light, but also form images of light through the refractive system of the cornea (1.38), aqueous humor (1.34), lens (1.42), and vitreous body (1.34) with different refractive indices. If the refractive index is similar to that of air, no image can be formed; at the same time, in addition to the light in front of the eyes, the light from other directions that was originally blocked will also shine on the photosensitive pigments, so there can only be light perception of light and dark, but no objects can be seen. It is like a film in a camera that can produce a correct image, but if the film is directly facing the scene, it will be exposed indiscriminately.
This is optical invisibility.
But this stealth technology also has its drawbacks, which is that it can be detected by other technical means.
The simplest one is sound wave detection. After all, you are just invisible, not disappeared, and various sound waves will still be reflected.
Another type of invisibility is specifically designed to be detected by various instruments.
The most typical ones are the various invisible weapons on Earth!
For example, a stealth bomber is a huge aircraft, but it uses various methods to reduce the reflection of radar waves, making it invisible to the radar.
The principle is that the fighter fuselage uses structure or coating technology to make the radar reflection area as small as possible. Radar works by emitting electromagnetic waves and then detecting the reflected signals, and then amplifying the signals, so there is a problem of the size of the reflection area. Stealth fighters use special structural design to make radar waves diffusely reflected and absorb radar waves through special coatings so that the reflection area is only a few tenths of a square meter under radar antenna detection. Stealth fighters can greatly weaken the enemy's detection effect through various technologies. Using stealth performance, stealth fighters can form an overwhelming absolute advantage over non-stealth fighters and can easily break through the enemy's air defense firepower network to carry out precision strike missions. The most critical stealth of stealth fighters is radar stealth, in addition to infrared stealth and radio frequency stealth. Radar detection is the most commonly used detection method. Stealth fighters must reduce their own radar cross-section (RCS) through carefully designed shapes and special stealth coatings, that is, reduce the intensity of the radar waves reflected back to the enemy. First of all, stealth aircraft should reflect radar waves to other directions to the greatest extent possible, adopt a wing-body fusion structure, slow down the transition of the fuselage structure, and reduce the sharp corners and planes of the aircraft fuselage that are easy to reflect radar waves. Use an outward-inclined vertical tail and ventral fin, and traditional antennas and sensors should be built-in as much as possible to ensure the flatness of the fuselage surface. Compared with non-stealth fighters, stealth fighters have specially designed bomb bays that mount ammunition internally, and the bomb bay and landing gear bay adopt a serrated design. In addition to the aircraft shape, stealth aircraft will also use S-shaped air inlets to block the engine blades and weaken the reflection of radar waves by the air inlet. According to the principle of conservation of energy, the energy of radar waves will not disappear. Reducing the reflection intensity of radar waves in one direction of a stealth fighter will inevitably increase the reflection intensity in other directions. At the same time, some parts of the fuselage transition are also strong sources of radar wave reflection. It is unrealistic to rely solely on the appearance design to achieve the expected stealth effect. Stealth aircraft also need special stealth coatings to weaken the reflection of radar waves. There are many types of stealth materials, which basically convert the energy of radar waves into other forms of energy for consumption, or reduce the intensity of radar waves by interfering with them.
In addition to the stealth design that reduces radar detection, stealth fighters also need to focus on infrared stealth and radio frequency stealth. The development of infrared detection technology is very different from the past, and reducing the infrared radiation of aircraft is becoming more and more critical. Stealth aircraft generally cool the exhaust gas before discharging it, and at the same time, the heat of the engine nozzle is shielded in the structural design. In addition, some infrared stealth coatings can also suppress the infrared radiation of the entire aircraft.
Stealth fighters are figuratively described as "ghosts in the sky". They move in secret and can effectively avoid radar tracking. Thanks to the "stealth" materials that can absorb radar waves, stealth fighters can easily escape from radar's nose. The radar absorbers of stealth bombers can interfere with radar systems by blocking reflected radio waves. There are many types of radar absorbers, including non-resonant magnetic radar absorbers and resonant radar absorbers. The coating made of non-resonant magnetic radar absorbers contains ferrite particles, which can dissipate the radar waves "absorbed" by the bomber's surface as heat. This material can reduce the "visibility" of radar and can be used in a wide range of radar wave frequencies. Resonant radar absorbers are only effective in a very narrow frequency range, but their efficiency is very high as long as the radar wave frequency is within the range for which the material is designed. It has been calculated that when the thickness of this material is consistent with the wavelength of the radar wave, it can absorb signals in a specific frequency range as if it is "tuned". Just as a sponge can only hold a certain amount of water, stealth materials can theoretically only store and dissipate a limited amount of radar wave energy. However, under laboratory conditions, engineers tested the invisible materials at radar wave energies far exceeding those encountered in real life to ensure the effectiveness of the invisible materials in actual use.
However, this technology still has limitations.
That is, it is visible to the naked eye, which seems a bit nonsensical.
After all, whether it is a space battleship or a fighter plane, the attack is beyond the sight of the naked eye, so it doesn’t matter whether it can be seen by the naked eye or not.
But don’t forget, the Rainbow Bridge is not a radar!
It is closer to the naked eye perspective.
Therefore, if your fighter planes or warships can only prevent detection by radar and other detectors, then they are basically useless against the Rainbow Bridge!
What should be seen will still be seen.
Only the Dark Elves are able to achieve both invisibility.
Their stealth technology is quite powerful, and they are immune to any type of detection.
The last time the Dark Elves invaded Asgard, their fighter planes flew right into the faces of the Asgardians, and the Asgardians didn't even have time to notice!
"Impossible!" Thor said with absolute certainty: "The dark elves have been completely defeated!"
But someone soon retorted: "But we didn't exterminate them after all, did we? There must be some survivors!"
The hatred between the Dark Elves and Asgard is deeper and more naked than that between the Asgardians and the Frost Giants.
Frost Giants, strictly speaking, are noisy neighbors to the Asgardians!
Although annoying, strictly speaking, it poses no threat to Asgard!
That's right... Frost Giants are just that shameless. If Frost Giants weren't so barbaric and difficult to control, Asgard could even consider living in peace with them. After all, they are not a threat at all. For so many years, Frost Giants have been causing trouble for Asgard, but so what? They are easily dealt with. If it weren't for their own needs, Asgard could exterminate Frost Giants in a matter of minutes.
Therefore, Asgard generally dislikes and even hates the Frost Giants.
But because they have always had a firm advantage over the Frost Giants, the Asgardians do not hate their noisy neighbors as much.
But the dark elves are different.
They did indeed cause Asgard to suffer huge losses.
In fact, Asgard's victory that year was also due to luck. If it happens again, Asgard itself can't say for sure whether they can win!
Hatred will only be deep when both sides are evenly matched.
Especially the last time the Dark Elves raided, causing huge casualties to Asgard, this sentiment has risen again. Many people hope to completely eliminate the Dark Elves and prevent them from making a comeback.