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Gr 6 SC Ch 4A
Gr 6 Science
| Term | Definition |
|---|---|
| astronomy | the study of the stars, planets, and all other heavenly bodies |
| astronomers | scientists 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 stars 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 or 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 "spere of color" |
| corona | the 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 | the most distant object visible with the naked eye |
| Sagittarius Dwarf galaxy; Large Magellanic Cloud; and Small Magellanic Cloud | the three galaxies closest to our own |
| spiral, elliptical, and irregular | the three types of galaxies |
| Polaris | name of the North Star |
| Sirius | brightest star in the sky |
| Proxima Centauri (part of Alpha Centauri) | closest star to the Earth (not including the sun) |
| 93 million miles | distance from the earth to the sun |
| Ursa Minor | Polaris is found in which constellation |
| Perseus | Algol is found in which constellation |
| Leo (The Lion) | Regulus is found in which constellation |
| Cygnus (The Swan) | Deneb is found in which constellation |
| Gemini (The Twins) | Castor is found in which constellation |
| Orion (The Hunter) | Betelgeuse is found in which constellation |
| Gemini (The Twins) | Pollux is found in which constellation |
| Orion (The Hunter) | Rigel is found in which constellation |
| Taurus (The Bull) | Aldebaran is found in which constellation |
| Canis Major (The Big Dog) | Sirius is found in which constellation |
| Centaurus | Alpha Centauri is found in which constellation |
| solar prominence | a huge loop of cooler gas that erupts thousands of miles from the chromosphere, suspended gracefully in space by the sun's powerful magnetic field |
| 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 earth |
| 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 stairs that appear very close together from our perspective on earth, but are actually far apart |
| Ursa Major | Big Dipper is found in which constellation |
Created by:
timberswartz05