That is between the galaxies?
All astronomers know about the universe is known from observations. Peering into the depths of space, the space telescope Hubble sends to our planet pictures of distant stars, planets and galaxies. According to the scientists estimated only in the observable universe is about two trillion galaxies. It is hard to imagine, but thanks to the images we have of them and their location some idea. Astronomer Edwin Hubble in 1925 identified several types of galaxies: elliptical, irregular, typical spiral, rough spiral and lenticular. It turns out that scientists know what are the galaxies, and what's going on inside of them, but if they know that lies between galaxies?
15,000 galaxies in the Hubble telescope lens
What is a galaxy?
To begin with the example of the Milky Way, let's see what is a galaxy. Thus, the galaxy - it is a huge gravitationally bound system. It contains about 200 billion stars and nebula, dark matter, planets, clouds of dust and gas, as well as star clusters. All objects in the galaxy, are involved in the movement of relatively common center of mass. In the heart of the galaxy is a supermassive black hole, which, incidentally, reported scientists lately is behaving rather strangely.
It looks like the center of the Milky Way
Depending on the species, according to the classification of Edwin Hubble, each galaxy has its own characteristics. So, the Milky Way in its shape in profile remotely like a "flying saucer." And not so long ago, scientists discovered that our galaxy is not as flat as previously thought - it turned out that the Milky Way is more like an accordion, as the galaxy like crumpled near the edges. Distance between galaxies extremely large. Thus, the nearest to us is the Andromeda Galaxy at a distance of 2, 5 million light-years from Earth. This distance is difficult to imagine. But what lies between galaxies?
By the way, to discuss whether our galaxy collide with the Andromeda galaxy may be in our chat Telegram
Another mystery of the universe
Shortly after the Big Bang, the universe was filled with a gas, mostly hydrogen. Over time, here and there, gravity began to pull gas to the clouds, which later turned into the galaxy in which stars are born. Do you know the reason why the stars shine? All the matter in a thermonuclear hydrogen burning - those stars that turn into a supernova and die after an explosion "pushed" back gas from the galaxies.
There, a mysterious intergalactic space, the gas cools and becomes more dense. There he is, as long as the force of gravity does not retract it back into the galaxy where new stars are formed. The process is repeated: Gravity condenses the gas in the galaxies and stars, the stars explode and emit gas, gravity pulls gas and again new stars are born.
Hubble Telescope took a picture of a supernova explosion
Over time, in any galaxy begins to run the process gas. And without gas in the universe can not form new stars; old stars live their lives and die, and eventually dying galaxy too. Galaxy inhabit the so-called gas-bath environment from which they were born, and which feeds them. Galaxy inhale and exhale the gas and the stars continue to burn until the gas is gone. It sounds good, right?
Even more amazing facts about the universe, please visit our channel in Yandex. Zen
What is the universe?
Previously, the problem of verification of this theory was that astronomers devices were barely able to detect signs of intergalactic gas, not to mention its appearance and disappearance. However, today, thanks to more sensitive instruments, scientists know much more. These data suggest that the intergalactic medium is rich in gas, which fills the universe and generates the galaxy. Slightly less convincing, and sometimes mysterious evidence about the galactic environment show that the galaxy live by recycling gas into stars and of stars.
But the evidence that galaxies may end up gas and stars will no longer be produced, resulting in the death of a galaxy far only preliminary. The fact is that even in the early universe is not homogeneous gas. Intergalactic medium also is not pure hydrogen: it is partly filled with elements heavier than hydrogen, that appear when a star burst and die.
Scientists: Our galaxy is similar to the English letter the S
Yet, despite the many problems, the scientists agree that this ancient, cooling, rarefied intergalactic medium is a well-understood entity that provides a compelling picture of when and from which the galaxies.
However, despite the emergence of new tools and collaboration of scientists, today the overall picture of the birth, life and death, no galaxies. To better understand this, scientists have resorted to the help of computer simulations - so recently, astronomers have created 8 million galaxies inside the computer. Regardless of whether or not the real simulation, it is with their help, scientists will be able to get answers to questions about the nature of the intergalactic gas. The fact that the simulation - the most clear visualization of how the gas could create a galaxy. Scientists believe that today, 13, 8 billion years after the Big Bang, only 60% of the gas is concentrated in the intergalactic medium; else it stored in some medium and galactic inside galaxies. It turns out that the vast universe galaxies strung on emptiness, like lighted highway. Handsomely! Despite the fact that much remains a mystery.