Science- Chapter 25
Order by
28 terms
Terms | Definitions |
|---|---|
 Galaxy | a large group of stars, gas, and dust held together by gravity. |
| Universe | space conataining all known matter and energy. |
| Light Year | the distance light can travel in one year. |
| Steady State Theory | states that the universe has always been the same as it is now. |
| Oscillating Theory | states that the universe began with expansion. |
| Big Bang Theory | states that approximately 13.7 billion years ago and it began with an enormous explosion. |
| Andromeda | 2.2 billion lightyears away |
| Milky Way | Nickname for the galaxy that contains Earth. |
| Astronomer | a person who studies space. |
| Core | center of the sun where the sun's energy is produced by nuclear fusion. |
| Photosphere | we know this layer an the sun's surface. |
| Chromosphere | this is a deep red layer only visible during eclipses. |
| Convection Zone | hot and cool gases circulate, bringing the sun's energy to the surface. |
| Radiation Zone | this layer is so dense that light takes a long time to pass through. |
| Sunspots | areas of the sun's surface that appear darker than the surrounding surface because they are cooler. |
| Prominences | huge arching colums of gas. |
| Solar Flares | bright, violent eruptions of gas shooting outward from the sun. |
| CME's | occur when large amounts of electrically charged gas are ejected suddenly from the sun. |
| Star | a large mass of spherical mass of gas that gives off light. |
| Absolute Magnitude | measure of the actual amount of light a star gives off. |
| Apparent Magnitude | measure of the amount of light recieved on earth. |
| Main Sequence | stars create a diagonal band across the H-R diagram. |
| Giants | extreamly bright but not extreamly hot |
| Local Group | Earth's galaxy is the milky way wich is a part of the ______. |
| Elliptical Galaxies | large, three-demensional eclipses; most commen shape. |
| Spiral Galaxies | has spiral arms that wind ot from inner sections. |
| Irregular Galaxies | smaller, less commen galaxies with various different shapes |
| Studying | dying children in ancient Greek language. |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.