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history |
| anotehr word for spiral arms |
disks |
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porkchoppony Tue, 16 Sep 2008 21:59:41 GMT |
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| the big bang occured |
15-20billion years ago |
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porkchoppony Tue, 16 Sep 2008 21:59:41 GMT |
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| galactic clusters clumped into large groups |
superclusters |
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porkchoppony Tue, 16 Sep 2008 21:56:10 GMT |
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irregular galaxies
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no regular shape
have nebulas
Large and Small Magellanic Clouds
less common |
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porkchoppony Tue, 16 Sep 2008 23:53:07 GMT |
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| elliptical gallaxies |
spherical or elptical
no nebulas
most common |
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porkchoppony Tue, 16 Sep 2008 21:56:10 GMT |
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| spiral galaxies |
gigantic pinwheels of stars
HAVE NUCLEUS
HAVE NEBULAS
the milky way |
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porkchoppony Tue, 16 Sep 2008 21:56:10 GMT |
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| red shift |
galaxies are moving away from the center |
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porkchoppony Tue, 16 Sep 2008 21:53:12 GMT |
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| Edwin Hubble |
noteced the spectra of all the galaxies shoe a RED SHIFT |
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porkchoppony Tue, 16 Sep 2008 21:52:56 GMT |
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| galactic cluster |
galaxies pulled together by gravity |
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porkchoppony Tue, 16 Sep 2008 21:52:56 GMT |
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| What galactic cluster is the milky way part of... |
Local group |
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porkchoppony Tue, 16 Sep 2008 21:52:56 GMT |
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| Famous open cluster |
pleiades/seven sisters |
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porkchoppony Tue, 16 Sep 2008 21:52:56 GMT |
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| globular cluster |
MILLIONS of old stars found in the nucleus and halo |
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porkchoppony Tue, 16 Sep 2008 21:51:09 GMT |
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| OPEN CLUSTER (list how many stars- how old the stars are- where they are found) |
hundreds of new stars in SPIRAL ARMS |
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porkchoppony Tue, 16 Sep 2008 21:51:09 GMT |
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| Nebula |
clouds of gas where stars are born |
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porkchoppony Tue, 16 Sep 2008 21:51:09 GMT |
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| how mnay stars does the milky way contain? |
200-400 billion stars |
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porkchoppony Tue, 16 Sep 2008 21:51:09 GMT |
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| diameter of the Milky Way Galaxy |
100,000 LY |
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porkchoppony Tue, 16 Sep 2008 21:49:34 GMT |
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| two irregular galaxies orbiting the Milky Way |
Large and Small Magellanic Clouds |
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porkchoppony Tue, 16 Sep 2008 21:49:34 GMT |
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| diff. between regular and barred spirals |
round and elongated-bar shaped nucleus |
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porkchoppony Tue, 16 Sep 2008 21:49:34 GMT |
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| most common galaxy |
elliptical |
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porkchoppony Wed, 17 Sep 2008 00:07:39 GMT |
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| GALAXY |
large collections of stars and dust held together by gravity |
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porkchoppony Tue, 16 Sep 2008 21:47:58 GMT |
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| galaxies are classified into 3 types according to _____ |
shape |
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porkchoppony Tue, 16 Sep 2008 21:47:58 GMT |
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| who showed that there are mnay more galaxies in the universe than just the Milky Way Galaxy |
Harlow Shapley |
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porkchoppony Tue, 16 Sep 2008 21:47:58 GMT |
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| the universe is ______ years old. |
15-20 billion years old |
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porkchoppony Tue, 16 Sep 2008 23:44:51 GMT |
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| one light year equals |
6 trillion miles |
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porkchoppony Tue, 16 Sep 2008 21:46:22 GMT |
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| factors that influence the parralax include |
1. distance between observer and star
2. distance between sighting points |
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porkchoppony Tue, 16 Sep 2008 23:58:35 GMT |
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| gravity's role in orgin of the universe |
held clumps together when materials cooled |
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porkchoppony Tue, 16 Sep 2008 21:46:22 GMT |
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| what are three parts of evidence that support the "big bang theory"? |
1. heat evenly spread out throughout universe
2. clumps + stars and galaxies RED SHIFT
3. quasars happened the same time as the big bang |
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porkchoppony Tue, 16 Sep 2008 21:46:22 GMT |
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| globular cluster |
found in NUCLEUS and HALO .... MILLIONS OF OLD stars |
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porkchoppony Tue, 16 Sep 2008 21:35:59 GMT |
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| open cluser |
found in spiral arms HUNDREDS of NEW stars |
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porkchoppony Tue, 16 Sep 2008 21:35:59 GMT |
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| nebula |
clouds of gas where sstars are born |
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porkchoppony Tue, 16 Sep 2008 21:35:59 GMT |
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| quasar |
the most distant objects we have seen (12 billion LY from earth) starlike , give off more energy than 100 galaxies combined |
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porkchoppony Tue, 16 Sep 2008 21:35:59 GMT |
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| parralax |
the apparent change in the position of a star compared to the stars in the backround |
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porkchoppony Tue, 16 Sep 2008 21:32:16 GMT |
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| parsec |
3.26 light years |
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porkchoppony Tue, 16 Sep 2008 21:32:16 GMT |
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| light year |
the distance light can travel in one year |
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porkchoppony Tue, 16 Sep 2008 21:32:16 GMT |
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| red shift |
a star moving away from us, the lines in the stars spectrum will be shifted toward the red end of the spectrum |
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porkchoppony Tue, 16 Sep 2008 21:32:16 GMT |
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| doppler effect |
the frequency of a wave increases if the source of the waves moves toward us and decreases if it moves away |
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porkchoppony Wed, 17 Sep 2008 00:01:34 GMT |
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| open universe theory |
galaxies will move farther and farther apart and stars will use up their fuels and burn out . universe will end in empty blackness |
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porkchoppony Wed, 17 Sep 2008 00:00:15 GMT |
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| closed universe theory |
expansion of the universe comes to a halt then gravity will pull the galaxies back toward the center of the universe making another "big bang" |
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porkchoppony Tue, 16 Sep 2008 23:59:13 GMT |
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| Big Bang Theory |
the universe expanded after a huge explosion of concentrated energy and matter and has since expanded |
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porkchoppony Wed, 17 Sep 2008 00:05:19 GMT |
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