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6 Sci Test 7 Ch 4A

TermDefinition
astronomy the study of the star, planets, and all other heavenly bodies
astronomers scientist who study outer space
vacuum an area containing no air or any other matter
friction the force that resists motion
galaxy a star system containing from millions to billions of stars
Milky Way the galaxy in which we live
Local Group the cluster of about 40 galaxies that includes the Milky Way
barred spiral a spiral galaxy in which the spiral arms are attached to a straight "bar" that runs through the center of the galaxy
nebulae large clouds of gas and dust in space
constellation the star outlining an imaginary picture in the sky
axis of rotation an imaginary line that stretches from pole to pole through the interior of the earth, around which the earth rotates
core (of sun) the central part of the sun that is the hottest region
photosphere the sun's visible surface ("sphere of light:")
sunspots darker spots of blotches that slowly move across the face of the sun as the sun rotates
solar eclipse an event that occurs when the earth's moon passes in front of the sun, blocking the sun's light
chromosphere the part of the sun's atmosphere closest to the sun's surface, has a delicate pink or orange color ("sphere of color")
corona hottest region of the sun's atmosphere; a haze of very hot gases that extends hundreds of thousands of miles from the surface of the sun
solar wind a faint "wind" of high-speed particles that stream from the sun
light year the distance light travels in one year (about 5.9 trillion miles)
nova an occurrence when a star suddenly flares up to many times its original brightness
supernova the actual explosion of a star
Andromeda galaxy most distant object visible with the unaided eye
closest 3 galaxies to our own Sagittarius Dwarf galaxy, Large Magellanic Cloud and Small Magellanic Cloud
3 types of galaxies spiral, elliptical & irregular
Polaris name of the North Star also in Ursa Minor
Sirius brightest star in the sky
Proxima Centauri Closest star (except Sun) to Earth,
distance from the earth to the sun 93 million miles
Algol star in constellation Perseus
Regulus star in constellation Leo (The Lion)
Deneb star in constellation Cygnus (The Swan)
Castor star in constellation Gemini (The Twins)
Pollux star in constellation Gemini (The Twins)
Betelgeuse star in constellation Orion (The Hunter)
Rigel star in constellation Orion (The Hunter)
Aldebaran star in constellation Taurus (The Bull)
Sirius star in constellation Canis Major (The Big Dog)
Alpha Centauri star in constellation Centaurus
solar prominence a huge loop of cooler gas that erupts thousands of miles from the chromosphere
solar flare tremendous burst of energy on sun caused by sudden changes in sun's magnetic field
apparent magnitude the apparent brightness of a star as seen from the earth absolute magnitude
absolute magnitude the actual brightness of a star, or how much light the star produces
binary star a group of two stars that circle around each other; a double star
optical double a pair of stars that appear very close together from our perspective on earth, but are actually far apart
Created by: Mrs_CC
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