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SFS A2 science notes

SFS A2

TermDefinition
Astronomy The branch of science that deals with celestial objects, space, and the physical universe as a whole.
Big bang theory A theory that the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density.
Doppler shift A change in frequency due to the Doppler effect.
Red shift The displacement of spectral lines toward longer wavelengths.
Frequency The rate at which something occurs or is repeated over a particular period of time or in a given sample.
Wavelength The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
Absolute brightness The total amount of light produced by a star irrespective of it's distance from an observer.
Apparent brightness The brightness of a star as measured by an observer, as opposed to it's intrinsic brightness when corrected for distance or absorption.
CMB Is the thermal radiation left over from the time of recombination in Big Bang cosmology.
Universe All existing matter and space considered as a whole.
Galaxy A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Star A fixed luminous point in the night sky that is a large, remote incandescent body like the sun.
Planet A celestial body moving in an elliptical orbit around a star.
Corona The rarefied gaseous envelope of the sun and other stars.
Prominence The state of being important of famous
Light year A unit of astronomical distance equivalent to the distance that light travels in one year which is nearly 6 trillion miles.
Nebular Of, relating to, a nebula or nebulae
Red giant A very large star of high luminosity and low surface temperature.
Nova A star showing a sudden large increase in brightness and then slowly returning to it's original state over a few months.
Cosmology The science of the origin and development of the universe
Created by: guerrac
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