21. Interstellar Medium And The Milky Way interstellar medium and the Milky Way. http://www.astronomynotes.com/ismnotes/s1.htm

Interstellar Medium and the Milky Way Chapter index in this window Chapter index in separate window This material (including images) is . See my for fair use practices. Our solar system is inside a large galaxy known as the Milky Way . All of the stars you can see at night and several hundred billion more are all bound together gravitationally into a huge cluster called a galaxy . Most of the stars in our galaxy are far enough away that they blend together in a thin band across the sky. If you are fortunate enough to view a dark sky outside of the glare of the city lights, you will see this milky band running through the constellations Cassiopeia, Perseus, Taurus, Monoceros, Vela, Crux, Norma, Sagittarius, Scutum, Aguila, Cygnus, and Lacerta. To people of long ago, this band looked like milk had been spilled along a pathway, so it was called the Milky Way. This chapter covers the radical discoveries made in the 20th century of the nature of the Milky Way and our place in it. The vocabulary terms are in boldface Go to next section Go to Astronomy Notes home last updated: 25 May 2001 Is this page a copy of Strobel's Astronomy Notes?

22. Dust! (Interstellar Medium, Part I) - Suite101.com Fear no more! Previous Article Next Article Dust! (InterstellarMedium, Part I). Author Wesley Colley Published on March 6, 2000 http://www.suite101.com/article.cfm/astronomy/34953

Topics Articles Links Courses DIRECTORY COMMUNITIES BOOK CIRCLE SUITE U ... MY SUITE Search Suite101.com Within: Astronomy Education Search The Web Member Central Join Our Community! Login What's New Become a SuiteU Affiliate ... MemberUpdate Suite University About Suite University Suite University News Visit the University Course Listing ... FREE Demo Course New Topics Attachment Parenting A Day in the Life LDS Family Humor Beginning Organic Gardening ... More... Suite Events Fibromyalgia: Fighting Invisibility Teacher Appreciation Event 2004 Family Focus 2004 In Tune With Johann Sebastian Bach More about Suite101 About Suite101.com - Select a related topic - Amateur Astronomy Astronomy and Astrophysic Biographies of Scientists Home Education Homeschool Curriculum Rev Indexing Making Learning FUN! Math is fun Physics Lite Saving For College Science Surfing Social and Emotional Lear Success Strategies for Co Teachers Using Technology Teaching Computers To Chi Teaching ESL in Korea Welsh Language Words, Words, and More Wo Writing Well - Select a related course - Adventures in Impressioni Awesome Grades in Math an Beyond Stenciling Creating Dynamic Unit Stu Cure Your Math Anxiety: B Developing Basic Grammar Grant Research and Writin Helping with Homework Homeschooling Your Specia How to Start Homeschoolin Learning a Second Languag Stenciling 101 Study of Linguistics and Teacher's Net Teaching Writing to Child Teaching Writing to Child Understanding Poetry Visual Literacy - A Cours Visit Education Detailed Topic List Home Science and mathematics ... Astronomy Astronomy

23. Interstellar Medium, Part IV, Ionized Gas - Suite101.com interstellar medium, Part IV, Ionized Gas. The explosions are so violentthat they literally blow bubbles in the interstellar medium. http://www.suite101.com/article.cfm/astronomy/40875

Topics Articles Links Courses DIRECTORY COMMUNITIES BOOK CIRCLE SUITE U ... MY SUITE Search Suite101.com Within: Astronomy Education Search The Web Member Central Join Our Community! Login What's New Become a SuiteU Affiliate ... MemberUpdate Suite University About Suite University Suite University News Visit the University Course Listing ... FREE Demo Course New Topics Attachment Parenting A Day in the Life LDS Family Humor Beginning Organic Gardening ... More... Suite Events Fibromyalgia: Fighting Invisibility Teacher Appreciation Event 2004 Family Focus 2004 In Tune With Johann Sebastian Bach More about Suite101 About Suite101.com - Select a related topic - Amateur Astronomy Astronomy and Astrophysic Biographies of Scientists Home Education Homeschool Curriculum Rev Indexing Making Learning FUN! Math is fun Physics Lite Saving For College Science Surfing Social and Emotional Lear Success Strategies for Co Teachers Using Technology Teaching Computers To Chi Teaching ESL in Korea Welsh Language Words, Words, and More Wo Writing Well - Select a related course - Adventures in Impressioni Awesome Grades in Math an Beyond Stenciling Creating Dynamic Unit Stu Cure Your Math Anxiety: B Developing Basic Grammar Grant Research and Writin Helping with Homework Homeschooling Your Specia How to Start Homeschoolin Learning a Second Languag Stenciling 101 Study of Linguistics and Teacher's Net Teaching Writing to Child Teaching Writing to Child Understanding Poetry Visual Literacy - A Cours Visit Education Detailed Topic List Home Science and mathematics ... Astronomy Astronomy

24. Interstellar Medium interstellar medium. Key Concepts. (1) The interstellar medium (that s just a fancyname for the matter between stars) consists of lowdensity gas and dust. http://www.stormpages.com/swadhwa/stellarevolution/lecture9.htm

Lecture 9 INTERSTELLAR MEDIUM Key Concepts The interstellar medium (the matter between stars) consists of low-density gas and dust. Interstellar gas consists of denser, cooler clouds embedded in hotter intercloud gas. The interstellar medium is detectable because it emits, absorbs, and reflects radiation. (1) The interstellar medium (that's just a fancy name for the matter between stars) consists of low-density gas and dust. The fact that we can look out far into the galaxy means that there must be very little matter between stars otherwise it would absorb all the starlight. Nevertheless, interstellar space is not entirely empty. 99% of the interstellar medium consists of very low density gas. How low in density is it? Let me tell you. The air we breathe has a density of approximately 10 molecules per cubic centimeter. (One cubic centimeter = 1 milliliter = 1/1000 liter). By contrast, the lowest density regions of interstellar space contains ionized gas with a density of approximately 10 molecules per cubic centimeter.

25. Interstellar Medium - Wikipedia, The Free Encyclopedia interstellar medium. From Wikipedia, the free encyclopedia. See also Timelineof knowledge about the interstellar and intergalactic medium, Outer space. http://en.wikipedia.org/wiki/Interstellar_medium

Main Page Recent changes Edit this page Page history ... Printable version Not logged in Log in Help Other languages: Polski Deutsch Interstellar medium From Wikipedia, the free encyclopedia. The interstellar medium (or ISM ) is a term used in astronomy to describe the rarefied gas and dust that exists between the stars (or their immediate "circumstellar" environment) within a galaxy . The matter normally consists of about 99% gas particles and usually 1% of dust. This compound is usually extremely tenuous, with typical densities ranging from a few single to a few hundreds of a particles per cubic centimeter. Generally the gas is roughly 90% hydrogen and 10% helium, with additional elements (" metals ", in astronomical parlance) present in trace amounts. The medium is also responsible for the cosmic extiction, namely the decreasing light intensity of a star as the light travels through the medium. The extinction is caused by refraction and absorbtion of photon in certain wavelenghts. For example, the typical absorbtion wavelength of molecular hydrogen lies at ca. 92nm, n=1, The Lyman Alpha Series. So it is nearly impossible to see light emitted at that wavelength from a star, because most of it is used for Lyman Alpha absorbtion.

26. Timeline Of Knowledge About The Interstellar And Intergalactic Medium - Wikipedi (Redirected from Timeline of the interstellar medium and intergalacticmedium). Timeline of the interstellar medium and intergalactic medium. http://en.wikipedia.org/wiki/Timeline_of_the_interstellar_medium_and_intergalact

Main Page Recent changes Edit this page Page history ... Printable version Not logged in Log in Help Timeline of knowledge about the interstellar and intergalactic medium (Redirected from Timeline of the interstellar medium and intergalactic medium Timeline of the interstellar medium and intergalactic medium Lord Rosse studies and names it the Crab Nebula William Huggins studies the spectrum of the Orion Nebula and shows that it is a cloud of gas Ira Bowen explains unidentified spectral lines from space as forbidden transition lines Robert Trumpler discovers absorption by interstellar dust by comparing the angular sizes and brightnesses of globular clusters Hendrik van de Hulst predicts the 21 cm hyperfine line of neutral interstellar hydrogen H.I. Ewen and Edward Purcell observe the 21 cm hyperfine line of neutral interstellar hydrogen Lyman Spitzer predicts coronal gas around the Milky Way James Gunn and Bruce Peterson use observations of the relatively low absorption of the blue component of the Lyman-alpha line from to strongly constrain the density and ionization state of the intergalactic medium Lewis Snyder David Buhl Ben Zuckerman , and Patrick Palmer find interstellar formaldehyde Arno Penzias and Robert Wilson find interstellar carbon monoxide George Carruthers observes molecular hydrogen in space Christopher McKee and Jeremiah Ostriker propose a three component theory of the interstellar medium Edit this page Discuss this page Page history What links here ... Recent changes This page was last modified 18:29, 22 Apr 2004. All text is available under the terms of the

27. Basic Topics The interstellar medium. Interstellar matter; Stromgren sphere; Supernovaremnants; A supernova snowplow; The birth of stars; What are http://astrosun2.astro.cornell.edu/academics/courses/astro201/top_ism.htm

The Interstellar Medium Interstellar matter Stromgren sphere Supernova remnants A supernova snowplow The birth of stars What are the cosmic abundances Recycling to the next generation of stars scattered light

28. Notes On The Interstellar Medium For Asph 503 This page gives links that are useful for the students in ASPH503,the interstellar medium course here at U of Calgary. Below are http://www.iras.ucalgary.ca/~volk/asph503.html

This page gives links that are useful for the students in ASPH503, the Interstellar Medium course here at U of Calgary. Below are links to PDF forms of my class notes; the PDF conversion is not always 100% correct for some reason that I have not been able to determine. However I think the files can be printed if desired. PDF (portable document format) is from Adobe Systems, and the Adobe Acrobat reader is needed to view them. The notes more or less replace a textbook, since the field is moving so rapidly and all the available textbooks that I know of are out of date. I have much more emphasis on molecular cloud properties and star formation than is normal in ISM textbooks, since these areas are two of the currently most active aspects of ISM research. The same is true of extragalactic ISM research, but there I was only able to put in a small amount of material mostly for comparison with the situation in the Galaxy. One thing that I could not make for the notes was a copy of the Columbia CO map of the Galaxy by Dame et al. This is refered to in the notes and there are some filler pages where I photocopied the original large-scale map from T. M. Dame et al. (1987; ApJ, 322, 706-720). A nice colour poster of this map is available from Dr. Dame. Some WWW images from the poster are found at this link These notes are free for the downloading, but I stress that they are by no means perfect or even polished. Some parts of them may reflect my ignorance rather than my knowledge. It was educational for me to put the notes together; things have changed a lot since I took this sort of course in 1981.

29. The Magnetized Interstellar Medium The Magnetized interstellar medium conference was hold in Antalya, Turkey, on 812September 2003, supported by the Max-Planck-Institut für Radioastronomie http://www.mpifr-bonn.mpg.de/div/konti/antalya/

Home Proceedings Antalya 8-12 September 2003, Antalya, Turkey The Magnetized Interstellar Medium conference was hold in Antalya, Turkey, on 8-12 September 2003, supported by the Max-Planck-Institut für Radioastronomie and the Akdeniz University. Proceedings are now being printed. Scientific Committee R. Wielebinski (MPIfR, chair), A. Alpar (Sabancý University), R. Beck (MPIfR), B. Gaensler (Harvard University), J.L. Han (NAO/CAS Beijing), T.L. Landecker (DRAO), M.E. Özel (Abant Ýzzet Baysal University), W. Reich (MPIfR), A.R. Taylor (University of Calgary), M. Urbanik (Jagiellonian University), B. Uyanýker (MPIfR) Local Committee Z. Aslan (Akdeniz University), B. Uyanýker (MPIfR), A. Yar-Uyanýker (MPIfR), W. Reich (MPIfR), P. Reich (MPIfR) The meeting will take place at the Antalya Sheraton Hotel Antalya web site Places to see Weather in Antalya Turkish National Observatory Max-Planck Institut f ür Radioastronomie

30. The Interstellar Medium next up previous Next Galactic population Up An overview PreviousOptical and other high. The interstellar medium. Refractive index http://www.atnf.csiro.au/research/pulsar/psr/Tutorial/tut/node14.html

Next: Galactic population Up: An overview Previous: Optical and other high The interstellar medium Refractive index for radio waves Refractive index is frequency dependent Frequency dependant delay in arrival time Dispersion Measure - DM Scattering Scintillation Faraday Rotation Figure 7: Dispersed pulses from the Vela pulsar. The bottom trace shown the profile obtained by dedispersing and summing the other traces. The asymmetric nature of the pulse profile is due to interstellar scattering. Jon Bell Thu Dec 19 15:15:11 GMT 1996

31. The Interstellar Medium next up previous Next Dispersion Up A Tutorial on Radio PreviousAssignment 1. The interstellar medium. Dispersion; Thin screen http://www.atnf.csiro.au/research/pulsar/psr/Tutorial/tut/node24.html

Next: Dispersion Up: A Tutorial on Radio Previous: Assignment 1 The Interstellar medium Dispersion Thin screen scintillation model Diffractive scintillation Refractive scintillation ... Faraday rotation and the Galactic B field Jon Bell Thu Dec 19 15:15:11 GMT 1996

32. Physics 7 Lecture #13(Cont'd) - The Interstellar Medium Diego Physics 7 Introduction to Astronomy. HE Smith, Winter 2001.Physics 7 - Lecture Summary 13 (Continued) The interstellar medium, http://cassfos02.ucsd.edu/physics/ph7/ISM.html

University of California, San Diego Physics 7 - Introduction to Astronomy H. E. Smith Winter 2001 Physics 7 - Lecture Summary #13 (Continued) The Interstellar Medium Although space is very empty and the stars in the Milky Way are very far apart, the space between the stars contains a very diffuse medium of gas and dust astronomers call the interstellar medium (ISM) . This medium consists of neutral hydrogen gas (HI), molecular gas (mostly H ), ionized gas (HII), and dust grains. Although the interstellar medium is, by several orders of magnitude, a better vacuum than any physicists can create in the laboratory there is still about of 5-10 billion M of gas and dust out there, comprising approximately 5% of the mass of visible stars in the Galaxy. Neutral Hydrogen Gas The Milky Way Galaxy is filled with a very diffuse distribution of neutral hydrogen gas which has a typical density of about 1 atom/cm g/cm ). The interstellar medium is far too cool to excite the UV or optical transitions of hydrogen, but there is a feature at 21 cm wavelength in the radio produced by the spins (magnetic fields) of the hydrogen atom's nuclear proton and orbiting electron. Because the proton and electron are spinning distributions of electric charge they create minute magnetic fields which interact, creating a small energy difference between the state in which the poles are aligned versus counter-aligned. This energy difference corresponds to the energy of radio waves at 21-centimeters. Every once in a while (about once per 500 years) hydrogen atoms will collide, exciting an atom into the higher energy spin-aligned configuration. It will take as long as 30 million years for the atom to jump back to the lower energy state via a

33. The Interstellar Medium University of California, San Diego Center for Astrophysics SpaceSciences. Gene Smith s Astronomy Tutorial The interstellar medium, http://cassfos02.ucsd.edu/public/tutorial/ISM.html

University of California, San Diego Gene Smith's Astronomy Tutorial The Interstellar Medium Although space is very empty and the stars in the Milky Way are very far apart, the space between the stars contains a very diffuse medium of gas and dust astronomers call the interstellar medium (ISM) . This medium consists of neutral hydrogen gas (HI), molecular gas (mostly H ), ionized gas (HII), and dust grains. Although the interstellar medium is, by several orders of magnitude, a better vacuum than any physicists can create in the laboratory there is still about of 5-10 billion M of gas and dust out there, comprising approximately 5% of the mass of visible stars in the Galaxy. Neutral Hydrogen Gas The Milky Way Galaxy is filled with a very diffuse distribution of neutral hydrogen gas which has a typical density of about 1 atom/cm g/cm ). The interstellar medium is far too cool to excite the UV or optical transitions of hydrogen, but there is a feature at 21 cm wavelength in the radio produced by the spins (magnetic fields) of the hydrogen atom's nuclear proton and orbiting electron. Because the proton and electron are spinning distributions of electric charge they create minute magnetic fields which interact, creating a small energy difference between the state in which the poles are aligned versus counter-aligned. This energy difference corresponds to the energy of radio waves at 21-centimeters. Every once in a while (about once per 500 years) hydrogen atoms will collide, exciting an atom into the higher energy spin-aligned configuration. It will take as long as 30 million years for the atom to jump back to the lower energy state via a

34. The Interstellar Medium Electronic Editor H. Payne. The interstellar medium. Deuterium in theLocal interstellar medium R. Ferlet, M. Lemoine, and A. VidalMadjar; http://www.stsci.edu/stsci/meetings/shst2/node83.html

Next: Planetary Science Up: Contents Previous: Stars, Stellar Populations, and SNRs Science with the Hubble Space Telescope II Book Editors: P. Benvenuti, F. D. Macchetto, and E. J. Schreier Electronic Editor: H. Payne The Interstellar Medium Deuterium in the Local Interstellar Medium R. Ferlet, M. Lemoine, and A. Vidal-Madjar GHRS Observations of Interstellar Deuterium toward HZ 43 W. Landsman, U. J. Sofia, P. Bergeron Boron in the Very Metal-Poor Star BD-13 3442 L. M. Rebull, D. K. Duncan, A. M. Boesgaard, C. P. Deliyannis, L. M. Hobbs, J. R. King, and S. Ryan Boron in the Galactic Halo and Disk D. K. Duncan, F. Primas, K. A. Coble, L. M. Rebull, A. M. Boesgaard, C. P. Deliyannis, L. M. Hobbs, J. R. King, and S. Ryan The GHRS and the Heliosphere GHRS Observations of Diffuse Clouds in the Local Bubble C. Gry and O. Dupin Observations of Interstellar Clouds in the Galactic Halo E. L. Fitzpatrick Hot and Cold Gas in Extragalactic Superbubbles-Probing the Interstellar Medium of the Superbubble LMC2 in the Large Magellanic Cloud A. Caulet Gas and Dust Abundances in Diffuse Halo Clouds K. R. Sembach and B. D. Savage

35. Interstellar Medium And The Milky Way interstellar medium and the Milky Way. Full window version (looks a littlenicer). The vocabulary terms are in boldface. interstellar medium (ISM). http://astronomy.nju.edu.cn/astron/Astronomynotes/ismglxya.htm

Interstellar Medium and the Milky Way Full window version This material (including line art and animations) is See my for fair use practices. Most of the ground-based telescope pictures here are from the Anglo-Australian Observatory (AAO-used by permission). Our solar system is inside a large galaxy known as the Milky Way . All of the stars you can see at night and several hundred billion more are all bound together gravitationally into a huge cluster called a galaxy . Most of the stars in our galaxy are far enough away that they blend together in a thin band across the sky. If you are fortunate enough to view a dark sky outside of the glare of the city lights, you will see this milky band running through the constellations Cassiopeia, Perseus, Taurus, Monoceros, Vela, Crux, Norma, Sagittarius, Scutum, Aguila, Cygnus, and Lacerta. To people of long ago, this band looked like milk had been spilled along a pathway, so it was called the Milky Way. This chapter covers the radical discoveries made in the 20th century of the nature of the Milky Way and our place in it. The vocabulary terms are in boldface Interstellar Medium (ISM) Though the space between the stars is emptier than the best vacuums created on the Earth (those are enclosed spaces devoid of matter, not the household cleaning appliances), there is some material between the stars composed of gas and dust. This material is called the

36. Interstellar Medium Astronomy Astronomy. Most comprehensive resource on Astronomy interstellar medium.Show Astronomy (Astronomy interstellar medium) content on your web site http://astronomy.designerz.com/astronomy-interstellar-medium.php

Map.Designerz.com Science.Designerz.com Mars Landing Site Astronomy News ... Interstellar Medium Astronomy Solar System Stars Star Clusters Galaxies ... Astronomy Site Map News Mars News Astronomy News Science News Environment News Channels Visited Clear Featured Links Web Hosting Web Development Web Design Science.Designerz.com ... Astronomy A comprehensive resource on Astronomy Interstellar Medium Show Astronomy (Astronomy Interstellar Medium) content on your web site Reach Astronomy (Astronomy Interstellar Medium) Audience Save on Astronomy Interstellar Medium books, magazines and software See which Astronomy Interstellar Medium domain names are available Search Astronomy Interstellar Medium on other search engines Press Releases, Stories and Articles on Astronomy Interstellar Medium View all press releases Submit your press release View all articles Submit your article Featured Results (opens in a new window) Nebulae Part of a larger site on plasma physics. Ratings: 3 / 5 votes: 1 Interstellar Molecules evolutionary cycle Evolutionary cycle of Interstellar Organic Molecules - Fullerenes, PAHs, Polyyenes, and biomolecules.

37. Harvard Astronomy 208 Physicalprocesses in the interstellar medium of the Milky Way and other galaxies.......Astronomy 208 The Physics of the interstellar medium. Course http://cfa-www.harvard.edu/astro208/

Harvard University Department of Astronomy Astronomy 208: The Physics of the Interstellar Medium Instructor: Bryan Gaensler Teaching Fellows: Peter Sollins Scott Schnee Spring 2003 Tu., Th., 10:05-11:30 Observatory , A-101 EXAM GROUP: 12, 13 Course Description: Physical processes in the interstellar medium of the Milky Way and other galaxies. Line and continuum processes, excitation, ionization, dissociation, heating and cooling, neutral clouds, ionized gas, photo-ionized nebulae, molecular clouds, star forming regions, shocks, gas dynamics, magnetic fields, supernova remnants, dust. N.B.: The first lecture on 30 Jan will be a brief summary of the course structure and logistics. Formal lectures will begin on 4 Feb. Calendar Handouts (plus corrections to the text) Assessment Contact Info Back to Harvard University Department of Astronomy Academics Back to Harvard University Department of Astronomy Courses Comments or Questions? Contact Peter Sollins at psollins@cfa.harvard.edu Last modified on 21-May-2003

38. CfA Star Formation/Interstellar Medium Group Home Page This is the top page of the Star Formation/interstellar medium Group at the HarvardSmithsonianCenter for Astrophysics meta name=. Frame ALERT! http://cfa-www.harvard.edu/sfgroup/

39. 3.2.4 The Molecular Interstellar Medium 3.2.4 The Molecular interstellar medium. The evolution of galaxiesis driven by the cycling of gas among several forms, principally http://www.drao.nrc.ca/~bveidt/futures_doc/may_report_final/node45.html

Next: Physical and Chemical Structure Up: The Large Southern Array Previous: Outflows from Star-Forming Regions 3.2.4 The Molecular Interstellar Medium The evolution of galaxies is driven by the cycling of gas among several forms, principally diffuse clouds, dense clouds, star-forming cores, and circumstellar envelopes. Since the discovery of interstellar CO twenty-five years ago, we have learned a great deal about the diverse morphology and physical properties of the interstellar gas. However, our understanding of the origins of and the relationships between these various structures remains rudimentary. The physical properties of cold neutral gas are best studied using rotational transitions of molecules. Over a hundred different interstellar and circumstellar molecules have now been identified. Each of these has accessible lines, mostly at millimetre and submillimetre wavelengths. The complex energy structure of molecules makes them ideal diagnostics for gas with densities from 10 to 10 cm and temperatures from 10 to 1000 K. Molecular lines have become a tool for the study of molecular gas rivaling in power the recombination lines used at optical wavelengths since the 1950's and at radio wavelengths since the 1960's to probe the ionized gas. Physical and Chemical Structure of Molecular Clouds Shocks Photon Dominated Regions Diffuse Clouds and Very Cold Gas Thu Apr 10 15:22:13 PDT 1997

40. Galaxy Directory : Interstellar Medium < Astronomy < Science Galaxy Science Astronomy interstellar medium Stellar Phenomena@(69). Try searching for interstellar medium at ExactSeek.com. http://www.galaxy.com/galaxy/Science/Astronomy/Interstellar-Medium/

Web Directory News Domain Search terms: advanced Voyeur Search Options Yellow Pages ... Submit Your Site to this Directory Featured Listings Free Virus Scan Scan for spyware, malware and keyloggers in addition to viruses, worms and trojans. New threats and annoyances are created faster than any individual can keep up with. Try searching for INTERSTELLAR MEDIUM at ExactSeek.com. In addition to standard web search results, ExactSeek also offers targeted searches of specialized databases, including newsletters, articles, mp3 files, images, and comparison pricing. Find the information you need at ExactSeek.com! Look for Interstellar Medium at eBay - The World's Online Marketplace Find it at eBay - Over 5 million items for sale! The most fun buying and selling on the web! Try it, you'll love it! Find INTERSTELLAR MEDIUM at Searchwaves.com Catch the wave. Find Interstellar Medium at searchwaves.com. Site Listings Showing 1 - 20 of Sites Page Title URL The Web Nebulae The Web Nebulae by Bill Arnett If you look up at the night sky with your naked eye all you see is a black void with a few points of white light. But with a camera and a telescope an entirely different view unfolds in brilliant color and amazing detail. The pages that follow introduce a few of these spectacular objects. The study of the physics of many of these objects is of considerable ... URL: seds.lpl.arizona.edu/billa/twn/top.html [

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