chapter 11: the interstellar medium region in the constellation orion named the orion nebula which...
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Chapter 11: The Interstellar Medium
Region in the Constellation Orion named the Orion Nebula which is the closest star formation region to us.
Jets and disks appear to be part of the star birth process
Chapter 11: The Interstellar Medium
The interstellar medium is the region between the stars. It is composed of gas and dust that ultimately are the raw materials from which stars and planetary systems are made.
This wide angle photograph of our milky way galaxy shows dark dust lanes cutting through the plane of our galaxy.
Chapter 11: The Interstellar Medium
Astronomers can determine what the interstellar material is made of, its temperature, and velocity by observing the absorption lines produce when starlight passes through the clouds of material.
Blue light is also scattered more easily than red so the red light makes it through better, thus objects appear reddened.
Chapter 11: The Interstellar Medium
The clouds and dust of the interstellar medium tend to be cold and thin by our standards. Average temperature is 100 K with an average density of one atom per cm3.
On average there is one dust particle for every trillion atoms.
Chapter 11: The Interstellar Medium
Emission Nebula
Chapter 11: The Interstellar Medium
Dark Nebula
Chapter 11: The Interstellar Medium
21 centimeter radiation is produced when the spins of the electron and proton flip in a Hydrogen atom.
Radio astronomers can thus map out the distribution of Hydrogen throughout the galaxy
Chapter 11: The Interstellar Medium
Star formation take about 10 million years
Chapter 11: The Interstellar Medium
The emission part of the star formation region is only a small part of the giant cloud.
Chapter 11: The Interstellar Medium
The Orion Nebula
Chapter 11: The Interstellar Medium
More Orion
Individual stars forming in density fingers
Chapter 11: The Interstellar Medium
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