Interstellar medium - Study guides, Class notes & Summaries

How do we know that interstellar gas exists? - Because of optical emission lines (produced by hot hydrogen), radio emission (produced by cold gas), and absorption features in stellar spectra added by cold interstellar gas. What is the cause of astronomical 'reddening'? - It is the effect of dust in interstellar space absorbing blue light more readily than red light; therefore as star light passes through dust more of the red light makes it through making the star appear redder than it...

Test Bank for Horizons Exploring the Universe, 15th Edition by Michael A. Seeds, Dana Backman, Eric Wegryn. Complete chapters (Chap 1 to 21)test bank are included with answers. TABLE OF CONTENTS PART I: EXPLORING THE SKY. 1. Here and Now. Where Are We? When Is Now? Why Study Astronomy? 2. A User's Guide to the Sky. The Stars. The Sky: Its Motions and Cycles. 3. Cycles of the Sun and Moon. Cycles of the Sun. Astronomical Influences on Earth's Climate. The Changeable Moon. 4. The Orig...

Test Bank Complete_ 21st Century Astronomy Seventh Edition (7th), (2022) By Stacy Palen & George Blumenthal| All Chapters 1-24| Latest Version With Well Detailed Answers| Rated A+ Chapter 1: Thinking Like An Astronomer 4 Chapter 2: Patterns In The Sky—Motions Of Earth And The Moon 43 Chapter 3: Motion Of Astronomical Bodies 75 Chapter 4: Gravity 106 Chapter 5: Light 138 Chapter 6: The Tools Of The Astronomer 169 Chapter 7: The Formation of Planetary Systems 202 Chapter 8: The Terrestri...

Why do disk stars bob up and down as they orbit the galaxy? correct answers because the gravity of other disk stars always pulls them toward the disk Which part of the galaxy has gas with the hottest average temperature? correct answers the halo What is the typical percentage (by mass) of elements other than hydrogen and helium in stars that are forming right now in the vicinity of the Sun? correct answers 2% Where are most of the Milky Way's globular clusters found? correct answers in...

Complete Test Bank for Stars and Galaxies, 10th Edition by Michael A. Seeds ; ISBN13: 9781337399944...(Full Chapters included Chapter 1 to 19)...1. Here and Now. 2. A User's Guide to the Sky. 3. Moon Phases and Eclipses. 4. Origins of Modern Astronomy. 5. Gravity. 6. Light and Telescopes. 7. Atoms and Spectra. 8. The Sun. 9. The Family of Stars. 10. The Interstellar Medium. 11. Formation and Structure of Stars. 12. Stellar Evolution. 13. Deaths of Stars. 14. Neutron Stars and Black...

BGSU ASTR 2010 Study Guide for Final Exam Q&A 100% Solved | Graded A+ Interstellar Medium - The gas and dust that fills the space between stars in a galaxy. Interstellar medium composition (ISM) - A thin (few atoms/cubic centimeter) distributions of primarily hydrogen and helium. ~74% Hydrogen, ~24% Helium, <2% other (by mass) 99% gas, rest dust Average 1 atom per cm^3 How do we know that interstellar gas exists? - Because of optical emission lines (produced by hot hydrogen), radio ...

ASTR 102 Exam Questions With All Correct Answers Current Update We have learned that the centre of the milky way contains a very massive black hole. We developed this understanding by: - Answer -Monitoring the orbital motions of many individual stars in the very central parts of the Milky Way If the sun were to be squashed down small enough to become a black hole, then: - Answer -The planets in the solar system would orbit the Sun in unchanged fashion (but would receive no light from it) ...

Luminosity - The total amount of power a star emits into space that's measured in watts. Apparent Brightness - Amount of starlight that actually reaches Earth HR Diagram - is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage. Stars in the stable phase of hydrogen burning lie along the Main Sequence according to their mass. OBAFGKM - Oh Be A Fine Girl Kiss Me Main Sequence - the vast majorit...

Astro 102 Final Sets Questions With 100% Correct Answers | Latest Update What is the main reason that astronomers have devoted many years of effort to determining the rotation curve for the Milky Way galaxy - ANSWER : The rotation curve can be used to help us determine the distribution of the mass in the galaxy How does the diameter of the disk of the Milky Way compare to its thickness? - ANSWER : The diameter is about 100 times greater than its thickness The most common form...

What makes up the interstellar medium? gas and dust If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in? Rarefied clouds of atomic hydrogen. How does the interstellar medium obscure our view of most of the galaxy? Hydrogen gas produces so much visible light that the interstellar medium is opaque, blocking our view of anything beyond it. How can we see through the interstellar medium? by observing at wavelength...