Milky Way Galaxy. Cosmology: W. Herschel H. Shapley Shapley vs. Curtis Structure of our galaxy Mapping our galaxy (21cm) size, population, motion. Chapter 23 By reading this chapter, you will learn.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Shapley vs. Curtis
Structure of our galaxy
Mapping our galaxy (21cm)
size, population, motion
23-1 How astronomers discovered the solar system’s location within the Milky Way Galaxy
23-2 The shape and size of our Galaxy
23-3 How the Milky Way’s spiral structure was discovered
23-4 The evidence for the existence of dark matter in our Galaxy
23-5 What causes the Milky Way’s spiral arms to form and persist
23-6 How astronomers discovered a supermassive black hole at the galactic center
Wide-angle photograph spanning half the Milky Way, as seen from the equatorial latitudes. More than a million stars in the disk of our Galaxy fill this view, which covers a relatively clear window just 4º south of the galactic nucleus in Sagittarius.
3. T / F Some of the Apollo astronauts have seen MWG like this picture below.
1.c, 2.b, 3.F
Zoom out past Earth, Venus, Mercury & the Sun. Go beyond the solar system, and out of the Milky Way to our Local Group.
Watch the animation to learn how density wave works.
As the starts in our galaxy move through the high density area, start formations takes place out of the available interstellar matter.
IR view by COBE
1. a, 2. c, 3. c
This sequence shows how astronomers are using Chandra to help probe the mysterious region at the center of the Milky Way. The first image is a 900- by 400-light-year mosaic in X-rays taken by Chandra. The view then zooms into a smaller region that encompasses the latest Chandra discovery of puzzling, extremely hot and diffuse emission. From there, the sequence shows two even smaller fields of view of the region surrounding the Milky Way's supermassive black hole, known as Sgr A*. The final element is an artist's conception of Sgr A* itself and its accretion disk as it undergoes a flare.
1. d, 2. c, 3. false, there must be other source of gravity that we are not seeing.
HMilky Way galaxy: see 2nd&3rd page of your homework for this week!
This worksheet is to have you better understand the size of the Milky Way galaxy. In this picture of the Milky way galaxy, 1cm is represent 5,000 ly.