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outer space vocab

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QuestionAnswer
constellations regions divided in the sky that help with navigation
electromagnetic spectrum used to detect different ranges of wavelengths emited from objects
spectroscope spreads light into different wavelengths and is used to see a stars spectrum
spectrum the range of wavelengths that a star emits; the energy/composition/brightness of a star
light year is the distance light travels in 1 year of time
apparent magnitude is a measure of how bright the star appears from earth
absolute magnitude measures the stars luminosity or its actual brightness
star a large ball of gas held together by gravity with a core so hot that nuclear fusion occurs
convection zone where hot gas moves up towards the surface and cooler gas moves deeper in the interior. then moves quickly to the top.
radiative zone a shell of cooler hydrogen above a stars core.
photosphere the apparent surface of a star.
chromosphere is the orange-red layer of a star.
corona the wide, outermost layer of a stars atmosphere
sunspots the regions of strong magnetic activity and are cooler than the rest of the photosphere
prominences and flares are clouds of gas that make loops and jets extending int the corona and they begin above the photosphere
cme huge bubbles of gas ejected from the corona
solar wind charged particles that continually stream away from the sun
galaxy a huge collection of stars
dark matter matter that emits no light at any wavelengths
spiral galaxies has spiral arms that begin at a central disk.
elliptical galaxies have internal structure, contain old stars and have little to no dust
irregular galaxies these are oddly shaped
clusters galaxies held together by gravity
doppler shift how space stretches by measuring the speed at which galaxies move away from earth
red shifted galaxy is moving away
blue shifted galaxy is moving towards
dark energy the energy that pushes galaxies apart or away from each other
Created by: zande5
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