The Milky Way Galaxy
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- Alban Mosley
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1 The Milky Way Galaxy
2 A. Expert - I have done a lot of reading in this area already. B. Above Average - I have learned some information about this topic. C. Moderate - I know a little about this topic. D. Rookie - I am a blank slate but ready to learn. (AS300-UC4L:LQ)
3 A. Andromeda B. Kapteyn C. Magellanic D. Sagittarius (AS300-UC4L:LQ2)
4 Chapter Overview The Milky Way Galaxy What Lies Beyond Chapter 4, Lesson
5 Lesson Overview The Milky Way Galaxy and the Sun s Place In It The Four Components of the Galaxy Other Planetary Systems Black Holes The Center of the Milky Way Galaxy Chapter 4, Lesson
6 Click any link below to go directly to polling that question.. Planets that orbit stars outside the Solar System 2. Distance light travels in a vacuum in one year 3. Astronomical unit equal to 3.26 light-years 4. Large, flat part of a spiral galaxy 5. A spiral galaxy's central region 6. Outermost part of a spiral galaxy 7. Spherical group of thousands of stars 8. Outer halo 9. Electrically neutral particle Click here to return to this index.
7 Click any link below to go directly to polling that question. 0. Star-like object, gives off light, lacks sufficient mass. Rotating neutron star that emits beams of radio 2. Two stars that revolve around each other 3. Astronomy branch, measure positions/motions of celestial objects 4. Temporary brightening of light from a distant star 5. Rotating disk of gas orbiting a star Click here to return to this index.
8 Click any link below to go directly to polling that question. 6. An object whose escape velocity exceeds the speed of light 7. The radius of a sphere around a black hole from within which no light can escape 8. A star that grows brighter than usual for a time and then returns to its original state Click here to return to this index.
9 What are your thoughts about the possibility of discovering another Earth-like planet?
10 The Milky Way and the Sun s Place in It The Sun is one of about 200 billion stars that make up the Milky Way Galaxy Diameter ranges from about 00,000 to about 60,000 light-years Chapter 4, Lesson
11 The Shape of the Galaxy Stars are arranged in a wheel-shaped disk that circles around a bulging center Chapter 4, Lesson
12 The Sun s Location in the Milky Way Sun is about one-third to one-half of the way out from the galaxy s center Not too long ago scientists thought that the Sun was at least fairly near the galaxy s center Chapter 4, Lesson
13 WOW! Chapter 4, Lesson Fact: If you shrank the sun down to the size of a white blood cell and shrunk the Milky Way galaxy down using the same scale, the Milky Way would be the size of the United States
14 Chapter 4, Lesson
15 Andromeda, a Galaxy Similar to the Milky Way Almost everything you can see in the sky is in the Milky Way Galaxy Andromeda is visible in the autumn sky as a fuzzy patch 2.9T Chapter 4, Lesson
16 M3: The Andromeda Galaxy 3 st of 03 objects on Charles Messier's list of diffuse sky objects Chapter 4, Lesson
17 Gaia Probe video Chapter 4, Lesson
18 Astrometry Through the Ages Chapter 4, Lesson
19 The Four Components of the Galaxy. The Galaxy Disk A galaxy disk is the large, flat part of a spiral galaxy, rotating around its center Contains individual stars, clusters of stars, and almost all the gas and dust found in the galaxy Chapter 4, Lesson
20 The Four Components of the Galaxy, cont. 2. The Central Region of the Galaxy The nuclear bulge is a spiral galaxy s central region Milky Way Galaxy s nuclear bulge is about 2,000 parsecs, or 6,500 light-years, in diameter Packed more densely with stars, dust, and gas than any other part of the galaxy Chapter 4, Lesson
21 The Four Components of the Galaxy, cont. 3. The Halo Galaxy s halo is the outermost part of a spiral galaxy, nearly spherical and lying beyond the spiral A globular cluster is a spherical group of up to hundreds of thousands of stars, found primarily in a galaxy s halo Chapter 4, Lesson
22 The Four Components of the Galaxy, cont. 4. The Galactic Corona Beyond the galaxy s halo lies the galactic corona, or outer halo Scientists don t know what the corona consists of, but think it may include small black holes, cool dwarf stars, large numbers of neutrinos, and other exotic particles Chapter 4, Lesson
23 Black Holes A black hole is an object whose escape velocity exceeds the speed of light Escape velocity is the speed at which an object must travel to escape a star s gravity A growing black hole, called a quasar, can be seen at the center of a faraway galaxy in this artist's concept Chapter 4, Lesson Courtesy of NASA/JPL-Caltech
24 Black Holes, cont. The Three Measurements of a Black Hole:. Mass 2. Electric charge, either positive or negative 3. Angular momentum video Chapter 4, Lesson Courtesy of NASA/CXC/M. Weiss
25 Black Holes, cont. How Scientists Detect Black Holes: Because the gravitational field near a black hole would be so strong, any matter nearby would orbit very fast This hot material would radiate energy It would appear as an X-ray source Chapter 4, Lesson
26 The Center of the Milky Way Galaxy To observe the galactic nucleus, scientists use wavelengths in the infrared/radio part of the spectrum or in X-rays and gamma rays The massive-black-hole hypothesis seems to be the best explanation for the energy source in the Milky Way Galaxy and other similar galaxies Chapter 4, Lesson
27 A. Disk B. Nuclear bulge C. Halo D. Galactic corona (AS300-UC4L:LQ3)
28 A. Black hole B. Brown dwarf C. Dust disk D. Pulsar (AS300-UC4L:LQ4)
29 Review The Milky Way Galaxy is made up of hundreds of billions of stars that appear hazy from Earth because the stars blur together The Andromeda Galaxy, which is very similar in appearance to the Milky Way is about 2.9 million light years away It took astronomers until the early twentieth century to get a good understanding that the nucleus of the Milky Way Galaxy has a massive black hole Chapter 4, Lesson
30 A. Angular Momentum B. Electric Charge C. Mass D. Size (AS300-UC4L:LQ5)
31 Note to Instructors: Click the Show/Hide Response Display Button (AS300-UC4L:LQ6)
32 Summary The Milky Way Galaxy and the Sun s Place In It The Four Components of the Galaxy Other Planetary Systems Black Holes The Center of the Milky Way Galaxy Chapter 4, Lesson
33 Next Done The Milky Way Galaxy Next EXAM prep Exam - 5 Dec 206 Luminous Blue Variable Chapter 4, Lesson Courtesy of NASA/JPL-Caltech/UC Berkeley
34 A. Exoplanets B. Dwarf planets C. Galactic planets D. Accretion planets (AS300-UC4L:VQ)
35 A. Parsec B. Astronomical unit C. Light-year D. Nova (AS300-UC4L:VQ2)
36 A. Light-year B. Parsec C. Pulsar D. Nova (AS300-UC4L:VQ3)
37 A. Nuclear bulge B. Halo C. Galactic corona D. Galaxy disk (AS300-UC4L:VQ4)
38 A. Nuclear bulge B. Halo C. Galactic corona D. Galaxy disk (AS300-UC4L:VQ5)
39 A. Galactic corona B. Accretion disk C. Halo D. Globular cluster (AS300-UC4L:VQ6)
40 A. Andromeda galaxy B. Globular cluster C. Galactic corona D. Nuclear bulge (AS300-UC4L:VQ7)
41 A. Galaxy disk B. Globular cluster C. Galactic corona D. Nuclear bulge (AS300-UC4L:VQ8)
42 A. Parsec B. Neutrino C. Pulsar D. Nuclear bulge (AS300-UC4L:VQ9)
43 A. Pulsar B. Brown dwarf C. Dwarf star D. Binary star system (AS300-UC4L:VQ0)
44 A. Pulsar B. Neutrino C. Brown dwarf D. Parsec (AS300-UC4L:VQ)
45 A. Parsecs B. Doppler stars C. Astrometry D. Binary star system (AS300-UC4L:VQ2)
46 A. Doppler studies B. Astrophysics C. Astrometry D. Galactic studies (AS300-UC4L:VQ3)
47 A. Accretion B. Microlensing C. Pulsar D. Occultation (AS300-UC4L:VQ4)
48 A. Galactic disk B. Exoplanetary disk C. Accretion disk D. Galaxy disk (AS300-UC4L:VQ5)
49 A. Black hole B. Brown dwarf C. Pulsar D. Nova (AS300-UC4L:VQ6)
50 A. Accretion radius B. Schwarzschild radius C. Nova radius D. Pulsar radius (AS300-UC4L:VQ7)
51 A. Pulsar B. Nova C. Parsec D. Binary star (AS300-UC4L:VQ8)
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