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Chapter Fifteen PS

Physical Science - Chapter Fifteen (Stars, Galaxies, and the Universe)

Section One Telescopes Electromagnetic Radiation Energy that can travel through space in the form of waves
Visible Light A type of electromagnetic radiation, this is the light you can see with the naked eye
Wavelength The distance between the crest of one wave and the crest of the next
Spectrum A range of colors with different wavelengths
Optical Telescope A telescope that uses lenses or mirrors to collect and focus visible light
Refracting Telescope A telescope that uses a convex lens to gather and focus light
Convex Lens A piece of transparent glass, curved so that the middle is thicker than the edges
Reflecting Telescope A telescope that uses a curved mirror to gather and focus light
Radio Telescope, A telescope used to gather radio waves from objects in space
Observatory, A building that contains more than one telescope
Section 02; Characteristics of Stars - Constellation, A pattern of stars as viewed from Earth
Spectograph,A device that breaks light into a spectrum
Apparent Brightness, A star's brightness from Earth
Absolute Brightness, A star's actual brightness
Light-year, The distance light travels in a year
Parallex, The apparent change in position of an object when looked at from a different stand-point
Hertzsprung-Russel Diagram, A chart that graphs the star's absolute brightness against the star's surface temperature
Main Sequence, A "class" of star, most stars belong in this group
Section 03; Lives of Stars - Nebula, A large cloud of gas and dust in space
Protostar, The earliest stage of a star's "life"
Planetary Nebula, A glowing cloud of gas formed by a medium star
White Dwarf, The core of a star left behind by a planetary nebula
Supernova, The explosion a Supergiant causes when it runs out of energy
Neutron Stars, The remains of high-mass stars
Pulsars, Spinning neutron stars
Black Hole, An object with incredibly strong gravity
Section 04; Star Systems and Galaxies - Binary Stars, Star systems that have two stars
Eclipsing Binary,A system in which one star periodically blocks the light of the other
Open Clusters, Loose, disorganized cluster of stars
Globular Clusters Large groupings of older stars
Galaxy, A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity
Quasars, Young active galaxies with black holes in the middle of them
Spiral Galaxies, Galaxies that are shaped like a pinwheel
Elliptical Galaxies, Galaxies that are elliptically shaped
Irregular Galaxies, Galaxies that do not have regular shapes
Universe, All of space and everything in it
Scientific Notation, Uses powers of ten to write very large or small numbers in an easy way
Section 05; The Expanding Universe - Big Bang, Explosion that created the universe
Hubble's Law, States that the farther away a galaxy is, the faster it is moving
Cosmic Background Radiation, Radiation left from the big bang
Solar Nebula, Large cloud of gas and dust
Planettesimals, The very first stage of planets
Dark Matter, Matter that does not give off electromagnetic radiation
Dark Energy, Energy that is causing the expansion of the universe to accelerate
Created by: Quixotic