What is the interstellar medium?

interstellar medium is a name that scientists give highly scattered gas and dust found between the stars in the galaxy. Mix is ​​99% gas and 1% dust. Gas is 90% hydrogen and 10% helium. The density of the interstellar medium varies depending on where you are, and in what galaxy, but differ between several thousand to several hundred million particles per cubic meter, with a diameter in the milk path of approximately a million particles per cubic meter. Contrast it with an intergalactic medium that has only 100-1000 particles per cubic meter, or the average density of the universe that contains numerous massive cavities, while it up to a single particle for a cubic meter. Denser areas are more likely to condense into the stars. Very old galaxies, such as those that strong quasars, are Thomít higher average density than today's galaxies that aggregated into stars and planets. Aggregation always continues on all stages of interstellar medium, because new stars are born and die in clouds called Nebula. Starting Hubble VesThe slight telescope has significantly increased our knowledge of these bodies and how they move and interact with the interstellar medium.

The first philosopher to acknowledge the existence of the interstellar medium was Francis Bacon, who wrote about it in 1626. Francis Bacon was also created by a scientific method. He guessed that the interstellar medium moved along with the stars and was right. The diffuse particles of the interstellar medium are around the Galactic Center of almost a million miles per hour. Depending on how close the particles are to the Galactic Center, they take somewhere between several million and a few hnestred millions of years to complete rotation around the galaxy.

interstellar medium is cold and does a good job in blocking visible light where it is dense. We have trouble seeing our own galactic center, because dust makes it trillion times weaker than it would be otherwise, in certain wavelengths. In the infraredParts of the spectrum pass through the rays, so that the observatory, looking at the galactic center, must rely on the infrared.