21ST CENT. AST (LL) W/ CODE & WKBK >IB<
6th Edition
ISBN: 9780393415186
Author: Kay
Publisher: NORTON
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Concept explainers
Question
Chapter 15, Problem 1QP
To determine
The phases of interstellar medium include.
Expert Solution & Answer
Answer to Problem 1QP
Option (a),(b) and (d).
Explanation of Solution
Interstellar medium is the matter exists between the star systems in the galaxy includes dusts, gases and molecular form, cosmic rays and so on.
The dense region in the interstellar medium is very prone to the formation of the stars. As it is very dense the pressure in this region is too high.
As the pressure increases, temperature also increases and hence there is seldom possibility of existence of hot gas in high dense state and other combinations are possible.
Conclusion:
The all possible combinations can be a phase of interstellar medium except the high dense gas at high temperature. Thus, option (a), (b) and (d) are correct.
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Based on what you know about observations of the interstellar medium at wavelengths other than for visible light, select all of the correct statements from the following list.
-The 21-cm radio observations are of neutral hydrogen.
-Much interstellar dust between stars is not visible.
-The source of hot gas observed at X-ray wavelengths is not known.
-All interstellar material is cool.
-Interstellar dust is observed at ultraviolet wavelengths.
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-Material observed at wavelengths longer than that of visible light is usually cool.
The water molecules now in your body were once part of a molecular cloud. Only about onemillionth of the mass of a molecular cloud is in the form of water molecules, and the mass density of such a cloud is roughly 1.5x10-21 g/cm? (questions in picture)
Chapter 15 Solutions
21ST CENT. AST (LL) W/ CODE & WKBK >IB<
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QPCh. 15 - Prob. 2QPCh. 15 - Prob. 3QPCh. 15 - Prob. 4QPCh. 15 - Prob. 5QPCh. 15 - Prob. 6QP
Ch. 15 - Prob. 7QPCh. 15 - Prob. 8QPCh. 15 - Prob. 9QPCh. 15 - Prob. 10QPCh. 15 - Prob. 11QPCh. 15 - Prob. 12QPCh. 15 - Prob. 13QPCh. 15 - Prob. 14QPCh. 15 - Prob. 15QPCh. 15 - Prob. 16QPCh. 15 - Prob. 17QPCh. 15 - Prob. 18QPCh. 15 - Prob. 19QPCh. 15 - Prob. 20QPCh. 15 - Prob. 21QPCh. 15 - Prob. 22QPCh. 15 - Prob. 23QPCh. 15 - Prob. 24QPCh. 15 - Prob. 25QPCh. 15 - Prob. 26QPCh. 15 - Prob. 27QPCh. 15 - Prob. 28QPCh. 15 - Prob. 29QPCh. 15 - Prob. 30QPCh. 15 - Prob. 31QPCh. 15 - Prob. 32QPCh. 15 - Prob. 33QPCh. 15 - Prob. 35QPCh. 15 - Prob. 36QPCh. 15 - Prob. 37QPCh. 15 - Prob. 38QPCh. 15 - Prob. 39QPCh. 15 - Prob. 40QPCh. 15 - Prob. 41QPCh. 15 - Prob. 42QPCh. 15 - Prob. 43QPCh. 15 - Prob. 44QPCh. 15 - Prob. 45QP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Why evidence can you cite that the interstellar medium contains both gas and dust?arrow_forwardPrepare a table listing the different ways in which dust and gas can be detected in interstellar space.arrow_forwardA molecular cloud is about 1000 times denser than the average of the interstellar medium. Let’s compare this difference in densities to something more familiar. Air has a density of about 1 kg/m3, so something 1000 times denser than air would have a density of about 1000 kg/m3. How does this compare to the typical density of water? Of granite? (You can find figures for these densities on the internet.) Is the density difference between a molecular cloud and the interstellar medium larger or smaller than the density difference between air and water or granite?arrow_forward
- Describe the characteristics of the various kinds of interstellar gas (HII regions, neutral hydrogen clouds, ultra-hot gas clouds, and molecular clouds).arrow_forwardThe star cluster shown in the image in Figure UN 20-3 contains cool red giants and main-sequence stars from hot blue stars all the way down to red dwarfs. Discuss the likelihood that planets orbiting any of these stars might be home to life. (Hint: Estimate the age of the cluster.)arrow_forwardWhere does interstellar dust come from? How does it form?arrow_forward
- Consider a grain of sand that contains 1 mg of oxygen (a typical amount for a medium-sized sand grain, since sand is mostly SiO2). How many oxygen atoms does the grain contain? What is the radius of the sphere you would have to spread them out over if you wanted them to have the same density as the interstellar medium, about 1 atom per cm3? You can look up the mass of an oxygen atom.arrow_forwardMost stars close to the Sun are red dwarfs. What does this tell us about the average star formation event in our Galaxy?arrow_forwardNew stars form in regions where the density of gas and dust is relatively high. Suppose you wanted to search for some recently formed stars. Would you more likely be successful if you observed at visible wavelengths or at infrared wavelengths? Why?arrow_forward
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