Barpalos Facts
To begin with, the ISS altitude is constantly changing. It ranges from 340 to 400 km above sea level. "How so? Just 340 kilometers? Yes, yesterday I went to the dacha one way, and then I drove more! Why can't you raise the station higher? " - some will be surprised. In fact, there is no need for this for two reasons: the conditions on the ISS are quite enough for carrying out the necessary experiments in zero gravity and designating the constant presence of a person in space. Another reason is related to economy: imagine how much more space powers would have to spend in order to deliver astronauts and cargo at a distance, for example, several thousand kilometers from Earth?

Why does the height of the station need to be changed all the time? The fact is that the ISS is slowed down by the rarefied atmosphere of the Earth. Yes, yes, at an altitude of 340 km, its influence is still noticeable, and air particles over time reduce the speed of the ISS, which is why it begins to approach the surface. The station's altitude would have to be adjusted less often if it were at an altitude of about 400 km, where the influence of the planet's atmosphere is minimized. Until recently, this remained impossible, as American astronauts were transported to the ISS using shuttles that could not reach an altitude of 400 km. But after their cancellation, the ISS ceiling was constantly adjusted upward: from 353 km in 2011 to 417 km in 2014. Approximately this orbital altitude is used on the ISS today.

This is interesting: did you know that time flows on the ISS differently than on Earth. How exactly - in our article "How does time go on the ISS?"

Another reason for changing the altitude of the ISS orbit is to avoid space debris. Experts 24 hours a day observe the movement of space debris in orbit, and if there is a possibility of collision, the ISS altitude is adjusted.

This is interesting: On a cloudless night with low illumination, the ISS can be seen from Earth. To do this, it is enough to know the time and date of the passage of the space station over your settlement. Information is available here
In May 2015, the Hubble telescope recorded an outburst of the most distant, and therefore the oldest known to date, galaxy. It took the radiation as much as 13.1 billion light years to reach Earth and be detected by our equipment. According to scientists, the galaxy was born about 690 million years after the Big Bang.

One would think that if the light from the galaxy EGS-zs8-1 (namely such an elegant name given to it by scientists) flew to us for 13.1 billion years, then the distance to it would be equal to the distance that the light will travel in these 13 , 1 billion years.

But we must not forget some of the features of the structure of our world, which will greatly affect the calculation of distance. The fact is that the universe is expanding, and it does so with acceleration. It turns out that while the light went 13.1 billion years to our planet, space expanded more and more, and the galaxy was moving away from us faster and faster. An illustrative process is shown in the figure below.

Given the expansion of space, the farthest galaxy EGS-zs8-1 is currently located about 30.1 billion light years from us, which is a record among all other similar objects. It is interesting that until a certain moment we will find more and more distant galaxies, the light of which has not yet reached our planet.

It is safe to say that the EGS-zs8-1 galaxy record will be broken in the future.
This is interesting: there is often a misconception about the size of the universe. Its width is compared to its age, which is 13.79 billion years. This does not take into account that the universe is expanding with acceleration. According to rough estimates, the diameter of the visible universe is 93 billion light years.
You've probably heard that mankind has studied space much better than the ocean, which is right under our noses. To find out whether this is so or not, one can reason from two different directions.

The simplest and fastest solution to this issue will be a statement that we do not even know how far our universe stretches, whether it is finite or infinite, as well as by what physical laws it lives. Therefore, of course, there is no question of any advantage in space exploration over the ocean.

But let's try to look at the problem from a different angle and take as the object of study not deep space with distances of tens and hundreds of thousands of light years, but our solar system and its surroundings. Let us recall the fact that more than ten people managed to visit the moon, spacecraft flew around and photographed almost all the local planets and even managed to dock to a comet, and some man-made objects have already left the solar system. Powerful radars pierce the cosmic void with radio waves, fixing the smallest objects around our planet, distances to the nearest celestial bodies are measured with an accuracy of a meter, and space telescopes look into such depths of space that we could not even imagine.

At the same time, only three people have visited the bottom of the deepest point of the Earth - the Mariana Trench - in history, the maps of the ocean floor, with rare exceptions, have been compiled with an accuracy of 5 km, and scientists regularly continue to discover all new biological species living in the depths.
Well, quite possibly, man really knows space better than his own ocean. But why do planets and stars attract much more than the depths of the world's oceans, in which, no one doubts, there are many minerals? Perhaps the answer to this question should be sought in the special nature of man, who has always strived to rise as high as possible: after all, the thought of flying into space, where you get closer to the stars, inspires much more than the thought of plunging into the dark abyss of the ocean.
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