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AstroLingo.pdf - Astro How Big? How Far? Units of Distance...

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AstroLingoGreek Letters...are used for the names of bright stars within a constellation (starting withα) and for the names of constants and variables in equationsGreek letterAstronomy ExamplesαAlphaαCentauri,αparticlesβBetaβPictoris(a young star)ΔDeltachange in something,(eg.Δλ)δDeltaδCepheii(a variable star)λLambdawavelength of lightμMumicro = 10-6(μm=micrometer)νNufrequency of lightπPi3.141…Area =πr2ρRhodensity (e.g.:ρcritical=Critical Density)σSigmaStephan-Boltzman ConstantΩOmegaCosmology constant =ρ/ρcriticalPluralize Me!Words derived from other languages haveinteresting plurals, like medium (media),and cactus (cacti).Fill in the missingplurals to these astronomy terms.SingularPluralNebulaNebulaeFocusFociSupernova_____________________NucleiAurora___________What’s the Diff?Look up these similar sounding words in yourglossary and write their meanings.A few are given.1.) Eclipse: ___________________________________Ellipse:Oval shape of planetary orbitsEcliptic: ___________________________________Elliptical:Shaped like an ellipse. Also, a type of galaxy2.) Angular: __________________________________Annular:Like a ring, or annulusAnnual: ___________________________________3) Equator:A line on Earth halfway between the North and South PoleCelestial Equator:___________________________
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Mass, Speed of light, Orders of magnitude, Metre

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