* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Chapter 21 power point - Laconia School District
Auriga (constellation) wikipedia , lookup
Gamma-ray burst wikipedia , lookup
Aries (constellation) wikipedia , lookup
Corona Borealis wikipedia , lookup
Hubble Deep Field wikipedia , lookup
Dyson sphere wikipedia , lookup
History of supernova observation wikipedia , lookup
Cassiopeia (constellation) wikipedia , lookup
Star of Bethlehem wikipedia , lookup
Corona Australis wikipedia , lookup
Astrophotography wikipedia , lookup
Aquarius (constellation) wikipedia , lookup
Type II supernova wikipedia , lookup
Stellar kinematics wikipedia , lookup
Stellar evolution wikipedia , lookup
Cosmic distance ladder wikipedia , lookup
Spitzer Space Telescope wikipedia , lookup
H II region wikipedia , lookup
International Ultraviolet Explorer wikipedia , lookup
Cygnus (constellation) wikipedia , lookup
Perseus (constellation) wikipedia , lookup
Corvus (constellation) wikipedia , lookup
Star formation wikipedia , lookup
Chapter 21 power point • Stars,galaxies, and the universe. constellation • A pattern of stars in the sky. Visible light • Electrom agnetic radiation that can be seen with the unaided eye. Electromagnetic radiation • Energy that travels through space in the form of waves. Wavelength • The horizontal distance between two wave crests. Spectrum • The range of wavelength of electromagnetic waves. Refracting telescope • A telescope that uses one or more mirrors to gather and focus light. Convex lens • A piece of transparent glass curved so that the middle is thicker than the edge Reflecting telescope • A telescope that uses one or more mirrors to gather light. Radio telescope • A device used to detect radio waves from objects in space. Observatory • A building that contains one or more telescopes. Spectrographs • An instrument that separates light into colors and photographs the resulting spectrum. Galaxy • A giant structure that contains hundreds of billions of stars. Universe • All of space and everything in it. Light-year • The distance that light travels in a year. Parallax • The apparent change in position of an object when seen from different places. Giant star • A very large star much larger than the sun. Apparent magnitude • The brightness of a star as seen from earth. Absolute magnitude • The brightness of a star as if it were a standard distance from earth. Hertzsprung-Russell diagram • A graph relating the temperature and brightness of a star. Main sequence • An area on the H-R diagram that runs from the upper left to the lower right and includes more than 90% of all stars. Pulsar • A neutron star that produces radio waves Nebula • A large amount of gas and dust in space spreaded out in an immense volume Protostar • A contracting cloud of gas and dust the earliest stage of a stars life. White Dwarf • The remaining hot core of a star after its outer layers have expanded and drifted out into space. Supernova • The explosion of a dying giant or supergiant star. Neutron Star A tiny star that remains after a supernova explosion. Black Hole • The remains of an extremely massive star pulled into a small volume by the force of gravity. Quasar • A distant galaxy with a black hole at its center. Binary Star • A star system that contains two stars. Eclipsing Binary • A star system in which one star periodically blocks light from another. Spiral Galaxy • A galaxy whose arms curve outward in a pinwheel pattern Elliptical Galaxy • A galaxy shaped like a flattened ball containing only old stars. Irregular Galaxy • A galaxy that does not have a regular shape. Big Bang • The initial explosion that resulted in the formation and expansion of the universe. Bibliography • The science book • And -> This power point is by Shanan Nathan Doug