Term
| Almost everything we see in the sky belongs to what? |
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Definition
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Term
| TRUE OR FASLE: early attempts show the sun at the eenter of the milky way |
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Definition
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Term
| three reaons why is it diffucult to determine the structure of the milky way? |
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Definition
1.we are inside
2. distance measuring is hard
3. Our view is obstructed |
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Term
| What is the name of a group of young clusters of recently formed stars, within disk of galaxy? |
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Definition
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Term
| What is the name of the old, centrally concentrated clusters formed in a halo around galaxy? |
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Definition
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Term
| How many globular clusters is the milky way known to have? |
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Definition
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Term
| What exists at the center of the galaxY? |
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Definition
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Term
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Definition
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Term
| what is the galaxy surrounded by? what is it filled wiht? |
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Definition
| a halo, filled with globular clusters |
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Term
| What classes are the most luminous stars? short or long lived? |
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Definition
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Term
| What kind of orbits do disks have? |
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Definition
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Term
| What kind of orbits do halo stars have? |
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Definition
| elliptical and randomly-oriented |
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Term
| how many years does it take for the sun to orbit the galactic center one time? |
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Definition
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Term
| What do the rotations of objects in the galaxy follow? |
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Definition
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Term
| what is the majority of mass in the galaxy called? |
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Definition
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Term
| do older or younger stars have more metaL? |
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Definition
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Term
| What is population I stars? Pop. II? |
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Definition
POP I: yield absorption lines from heavy elements and located at disk
POP II: yield absorption lines from hydrogen, located in halo |
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Term
| Where are Population II stars located? |
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Definition
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Term
| Where are POPulationI stars located? |
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Definition
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Term
| All elements heavier than ______ are rare. |
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Definition
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Term
| What does hot gas that breaks out of the galactic disk form? |
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Definition
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Term
| what is the total mass in disk of the mIlky way? |
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Definition
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Term
| What is used to determine distances to O and B associations? |
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Definition
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Term
| We can observe any direction in the Milky way thanks to.... |
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Definition
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Term
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Definition
| concentrated IN spiral arms |
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Term
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Definition
| concentrated ALONG spiral arms |
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Term
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Definition
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Term
| What is dominant in Grand-Design spiral galaxies? |
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Definition
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Term
| What galaxies have spiral patterns but not dominant spiral arms? |
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Definition
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Term
| what two things is star formation self-forming due to? |
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Definition
| ionization fronts and supernova shocks |
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Term
| What does the galactic center contain? |
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Definition
| a black hole of 2.6 million solar masses |
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Term
| what kind of xray binaries does the galactic center region contain? |
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Definition
| black hole and neutron star xray binaries |
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Term
| what did scientists conclude about the diameter of the star system? |
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Definition
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Term
| what can the mass of the galaxy be found from? |
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Definition
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Term
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Definition
| a process where stars manufacture metals |
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Term
| True or false. The sun is a population 1 star? |
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Definition
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Term
| What class stars are spiral tracers? |
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Definition
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Term
| the halo is made up of population _____ stars and the disk is made up of population ______ stars. |
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Definition
halo- population II
Disk- Population I |
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