Questions that modern science still can not answer

Each year, opening up new physical phenomena, proved the theory and created technology that just a few years ago seemed a fantasy. But in modern science there are processes, which led to the discovery of even more series of questions.

1. What is dark energy and dark matter?

For a long time the universe is shrouded in mystery and a lot of questions. What is her age? Does space start and end? Another question gnaws minds astrophysicists for many years. Why the universe continues to expand? After all, the power of cosmic gravity should oppose it. Therefore, scientists have suggested that there is some invisible "agent", which is much stronger than gravity. This phenomenon became known as dark energy. In the general sense of dark energy - a kind of cosmological constant, which is an integral part of the universe itself. The more expanded space, the more energy generated dark and vice versa.

If in the universe there is an unknown energy, it is logical to assume that there is also a matter. Scientists estimate that about 84% of the universe does not emit or absorb light, respectively, the space must be filled with something. This phenomenon has been dubbed dark matter. So far, there is not a single device that could identify dark matter. It is obvious that these phenomena do exist, but that it specifically and where to look, so far remains a mystery.

2. Are there parallel universes?

According to the modern theory of relativity, the universe has three spatial dimensions and one time dimension. In this theory, the universe all four dimensions are organically intertwined and smoothly into each other. But what if the space-time continuum is not really cyclical, and "flat"? This means that in the formation of the universe time, in fact, does not matter, and all phenomena are endless. If so, then our universe is only a part of the infinite multiverse, where there are parallel worlds.

3. What is at the center of a black hole?

Black holes are a favorite subject of study in astrophysics. In the conventional sense of a black hole - an area in the universe with gravitational field so strong that it can not even overcome the light. As a result of observations of the supermassive black hole at the center of our galaxy were obtained answers to many questions about these mysterious objects. But until now, scientists did not have the slightest idea of ​​what is in the center of a black hole. There may be a "singularity" - the point of infinite density, wherein the mass is concentrated in the infinitesimal area. This may be the reason that black holes absorb matter and even entire galaxies.

4. Can anything travel faster than light?

Since Einstein opened his legendary theory of relativity, the question of the maximum speed possible in the universe, it would seem, should have been solved forever. According to the theory, that the object was moving at the speed of light, it must have a maximum energy which are cosmic rays. On the other hand, even cosmic rays do not necessarily move at the speed of light. The speed limit up to a maximum value may also be the reason that we still do not come to contact with extraterrestrial civilizations. What if in other galaxies, the speed is not limited by the time the movement of light in a second? If there were a speed higher than the speed of light, it would violate causality - the relationship between the causes and consequences of events, and as a result of time travel would have been possible.

5. Is there a single theory?

In the 20th century two major theories that changed the vision of many physical phenomena were discovered. One of them - the theory of quantum mechanics - describing in detail the interaction of the smallest indivisible particles. Other - Einstein's theory of relativity - a physical level could explain such a large-scale phenomenon of the formation of galaxies. Both theories so far considered to be true. But that's only one problem - they are not compatible. Scientists still can not understand it and try to find a single, or as it is called, the theory of everything. So far, only a major breakthrough in this issue was the string theory that can explain the relationship between the theory of relativity and the theory of quantum mechanics. But it is not yet able to confirm the experiments, and the establishment of a unified theory remains open.