* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Galaxy Far Far Away ppt
Corona Australis wikipedia , lookup
Cassiopeia (constellation) wikipedia , lookup
International Ultraviolet Explorer wikipedia , lookup
Cygnus (constellation) wikipedia , lookup
Spitzer Space Telescope wikipedia , lookup
Drake equation wikipedia , lookup
History of supernova observation wikipedia , lookup
Fermi paradox wikipedia , lookup
Aries (constellation) wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
Rare Earth hypothesis wikipedia , lookup
Gamma-ray burst wikipedia , lookup
Formation and evolution of the Solar System wikipedia , lookup
Space Interferometry Mission wikipedia , lookup
Coma Berenices wikipedia , lookup
Open cluster wikipedia , lookup
Structure formation wikipedia , lookup
Modified Newtonian dynamics wikipedia , lookup
Hubble Deep Field wikipedia , lookup
Observational astronomy wikipedia , lookup
Perseus (constellation) wikipedia , lookup
Corvus (constellation) wikipedia , lookup
Timeline of astronomy wikipedia , lookup
Cosmic distance ladder wikipedia , lookup
H II region wikipedia , lookup
Andromeda Galaxy wikipedia , lookup
A Long Time Ago in a Galaxy Far, Far Away… The Milky Way Galaxy: Home Sweet Home!! Our home Galaxy is called the MILKY WAY (like the candy bar ) So named because early stargazers thought the stars looked like milk spilled across the sky. YOU ARE HERE… The Sun is located on the Orion Arm of the Milky Way If you look toward the constellation Sagitarius, you are looking toward the center of the galaxy. ~10,000 parsecs from the center of the galaxy. How huge is the Milky Way? “If there’s a bright center to the galaxy, you’re on the planet that it’s farthest from. “ ~Luke Skywalker, Star Wars SUN 3,300 LY 33,000 LY 75,000 LY Milky Way Dimensions: 75,000 light years from end to end 3,300 light years thick ~33,000 light years from the center of the galaxy to the Sun Mass: 4 x 1011 Solar Masses Galactic Anatomy NUCLEUS: Bright Center of the galaxy. NUCLEAR BULGE: Flattened cloud about 3 pc in radius around center of the galaxy. HALO: Area surrounding galaxy that contains some scattered globular clusters. DISK: Contains most of the stars in the galaxy. Jump to Hyperspace? By looking at the radial velocities of surrounding stars, we can estimate the Sun’s velocity to be about 220 km/s. It takes about 240 million years for the Sun to orbit the center of the galaxy! Like Spinning a Pizza… Clouds of hydrogen and helium from the Big Bang Star motion within causes it to rotate and contract Cloud begins to flatten into a disk Older stars are left behind in the halo The galaxy is now nearly flat Spiral Arms Home to hot bright stars (O and B) Used to trace the path of our spiral arms Star formation is continuously renewed in spiral arms Journey to the Center Nucleus is the most mysterious part Evidence of a Supermassive Black Hole in Saggitarius: High Intensity Radio Source Orbits of surrounding objects Huge Mass (2.6 million solar masses) Small size (3 pc) Event Horizon is smaller than a period! Too massive to be the remains of a star: possibly formed when galaxy did Hubble Deep Field: Elliptical Galaxies Spheres or Ellipses Spiral Galaxies Barred Spirals Irregular Galaxies Galactic Hugeness and Other Amazing Stuff Mega parsec = 3.26 million light years! Estimate distance using indicators (clusters, Cepheids, supernovae) Dark Matter: Measured mass is much larger than predicted mass, Gravitational lensing Massive Black Holes: evidence in orbits of stars in the center When Galaxies Collide… Formation of spiral arms Distortion or tearing Galactic Cannibalism Firestorms of Star Formation Galactic Mergers High Speed Collisions Local Group: Our Galaxy’s Neighbors The Milky Way is one of about 35 galaxies that are clumped close together. This clump is called the LOCAL GROUP. Milky Way Galaxy M31: Andromeda Galaxy Small Magellanic Cloud M33: Triangulum Galaxy Large Magellanic Cloud