Astronomy Galaxies There is dust that prevents us from seeing near the galactic plane All types of galaxies Elliptical just an elliptical shaped galaxy Bar spiral the stars emanate from the ends of the bars An ellipsoid is when you take an ellipse and rotate it 360 degrees the stars Spiral the distribution of stars follow spiral arms move at all kinds of speeds and in all directions Elliptical galaxies are very dense and the stars are on very specific orbits Irregular galaxies they are not random Find the perimeter from knowledge of the distance from the galactic center You can have different perceptions of the same object The reason for irregularites is because there is cannibalism between galaxies Two galactic centers in Andromeda Orbital speed around the galactic center is the same Dark matter is the hand that helps the stars go around the galaxy at the same speed Video Many stars packed together at the center of the galaxy Quasars look like stars but they are highly compact galaxies They outshine normal galaxies Radiowaves form a map that are invisible to normal telescopes Quasars produce their energy at a tiny region at their core Giant black holes may be at the center of galaxies The gas is squeezed at the center of the galaxies The black holes can grow to the size of the solar system The VLBI is a form of a very large telescope from a bunch of countries No causal relationship The event horizon is where the escape velocity is equal to the speed of light Material coming out of the black hole is an illusion The jets are because of the huge magnetic field from the particles going Some of the material is shot out of the black hole around the black hole This material is not coming out of the black hole Galaxies come in clusters Hubble s law Hubble discovered galaxies The farther away objects are the faster the objects move away from us This is hubble s law The slope is 70 Every MPc you move away from us add 70 km s to your speed The center of the universe is not in our universe We live in three dimensions
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