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Ch 10 '14

Astronomy

TermDefinition
astronomers People who study outer space and celestial bodies.
Big Bang theory A theory to explain how the universe happened.
celestial bodies Everything that is matter in the universe.
cosmological red shift Spectral lines are all shifted to longer (redder) wavelengths.
electromagnetic radiation Energy that comes out in the form of waves. Electromagnetic, meaning from the electromagnetic spectrum.
elliptical galaxy A type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile.
irregular galaxy A galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. .
nebula The place where stars are made from dust and hydrogen.
red shift The displacement of spectral lines toward longer wavelengths (the red end of the spectrum) in radiation from distant galaxies and celestial objects.
spectroscope An apparatus for producing and recording spectra for examination.
spiral galaxy A galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
star cluster A group (hence cluster) of stars.
Created by: mddai