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Dive into the mysteries of stars, galaxies, and the vast universe through constellations, electromagnetic radiation, telescopes, and cosmic phenomena. Understand concepts like light-year, supernova, and black hole. Discover the wonders of the Big Bang and more.
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Chapter 21 power point • Stars,galaxies, and the universe.
constellation • A pattern of stars in the sky.
Visible light • Electromagnetic 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-Rdiagram 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 ->
