* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Main Types of Galaxies
Corona Australis wikipedia , lookup
History of Solar System formation and evolution hypotheses wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
History of supernova observation wikipedia , lookup
History of astronomy wikipedia , lookup
International Ultraviolet Explorer wikipedia , lookup
Spitzer Space Telescope wikipedia , lookup
Drake equation wikipedia , lookup
Dark matter wikipedia , lookup
Fermi paradox wikipedia , lookup
Formation and evolution of the Solar System wikipedia , lookup
Outer space wikipedia , lookup
Aries (constellation) wikipedia , lookup
Perseus (constellation) wikipedia , lookup
Rare Earth hypothesis wikipedia , lookup
Space Interferometry Mission wikipedia , lookup
Gamma-ray burst wikipedia , lookup
Coma Berenices wikipedia , lookup
Lambda-CDM model wikipedia , lookup
Observable universe wikipedia , lookup
Modified Newtonian dynamics wikipedia , lookup
Structure formation wikipedia , lookup
Stellar kinematics wikipedia , lookup
Corvus (constellation) wikipedia , lookup
Observational astronomy wikipedia , lookup
Timeline of astronomy wikipedia , lookup
Cosmic distance ladder wikipedia , lookup
Andromeda Galaxy wikipedia , lookup
Star formation wikipedia , lookup
Future of an expanding universe wikipedia , lookup
Atlas of Peculiar Galaxies wikipedia , lookup
Galaxies What is a galaxy? • A galaxy is a large grouping of stars, gas, and dust in space that are held together by gravity. • The largest galaxies contain more than a trillion stars. Smaller galaxies may have only a few million. • Scientists estimate the number of stars from the size and brightness of the galaxy. Spiral Main Types of Galaxies Irregular Elliptical Properties of Spiral Galaxies • Shaped like flattened disks with one or more spiral arms. • Our galaxy, Milky Way, is a spiral galaxy. • Our solar system is located in one of the spiral arms. Properties of Elliptical Galaxies • About 1/3 of all galaxies. • Simply massive blobs of stars. • Round or elliptical in shape. • Contain very little gas or dust. • Because of little gas, no new stars are forming. • The largest and smallest galaxies are elliptical galaxies. Properties of Irregular Galaxies • Do not fit into any other category. • Chaotic mix of stars, gas and dust • Usually found near large spiral galaxies who may be distorting their shape. Contents of Galaxies Galaxies are made of stars, planetary systems, gas clouds, and star clusters. Nebulas are giant clouds of gas and dust where Nebula are found stars may be in spiral galaxies but not elliptical forming. galaxies. Galaxy Quiz Galaxy Quiz Galaxy Quiz What is the name of our galaxy? + Describe the Milky Way Galaxy Describe the Milky Way Galaxy • • • • • • • Flattened Disk Bulge in Middle Fried Egg Not solid from edge to edge Huge 1000-3000 Light Years Thick 100,000 Light Years across (Diameter) Where is our solar system in our galaxy? • The Sun and our solar system is located in one of the outer arms (Orion’s Arm) of the galaxy. The distance from the Sun to the center of the galaxy is about 30,000 light years. • All objects in the galaxy revolve around its center. • The sun and our solar system take about 240 million years to make one trip around the center of our galaxy.