Saturday, October 5, 2013


       Hello, reader! Today, the topic is. . .  galaxies!
       Galaxies are groups of stars, gas, and dust. They are held together by gravity.  There are hundreds of billions of galaxies in the universe.
      A supercluster is a group of galaxies stuffed together.  This is what it looks like:




  
 http://www.astro.ucla.edu/~ghezgroup/gc/journey/images/gc_color.jpg

There are four different shapes of galaxies:
  • Elliptical galaxies.  They look like flat spheres.

http://cas.sdss.org/dr5/en/proj/basic/galaxies/images/ellipt2.jpg

  • Irregular galaxies.  They have no symmetrical shape and they don't look like any other kinds of galaxies.





 https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7jHWTEzKoxfTWrasQuNN1-5dl6RTb8xC0BoYRugeyJ-RrI8kJYvVfneGmm_n2JPNWxk0uCEub1AUedQPodrFs8qmVDF6aCJCbum8zBudU5mCNJZzJdIJpy9YB8r8OCh42snUvLxKRAnM/s1600/Large+Magellanic+Cloud.jpg

  • Spiral galaxies.  They look like a pinwheel. 


 http://padante.com/wp-content/uploads/2013/01/Galaxy-crash-sparks-large-spiral.jpg
  • Barred spiral galaxies.  They are like spiral galaxies but they have a band of stars across the center.


http://www.newscientist.com/data/images/ns/cms/dn14431/dn14431-1_425.jpg

     Scientists believe that every galaxy has a black hole in the center. For epic info on black holes, visit my earlier post. Black holes are like parasites, eating away at the galaxy they inhabit. Eat, eat, eat. Sometimes, they eat too fast and get indigestion. Kidding. But they do spit out quasars, or pure beams of energy. This is incredibly destructive.
     Galaxies are moving away from each other as a result of left over "big bang" energy.  The center of the universe, where the "big bang" started, is pushing the galaxies out with energy that has still not died out.

      A Doppler shift is when galaxies are pushed away from, or pulled toward, each other.  A redshift is a galaxy that is being pushed away.  The galaxy has a reddish hue because it's heading toward the red end of the electromagnetic spectrum.  A blueshift is a galaxy that is being pulled toward another galaxy.  It has a bluish hue because it's heading toward the blue end of the electromagnetic spectrum.






http://www.astro.cornell.edu/share/sharvari/websiteV7/images/doppler.jpg


Thanks for reading my blog.  See you next time!
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16 comments:

  1. UnknownOctober 7, 2013 at 6:19 AM

    you could have had more info and you should have put your links some where else so it does not look like it is part of your info 15/20

    ReplyDelete
  2. MeapOctober 7, 2013 at 6:23 AM

    you need more info your links look likr there part of the paragraph so sorry but 8/20

    i like your pics

    ReplyDelete
  3. UnknownOctober 7, 2013 at 6:24 AM

    good info. i did not like that the links were right next to the pic and you need a better ending. ur overall grade is a 75% or 15/20

    ReplyDelete
  4. mariOctober 7, 2013 at 6:39 AM

    hi jack you got a 11/20 sorry but it was confusing and it had like one word for each type of galaxies you needed a lot more information. really a spirl galaxy is not a pin wheel.
    this is science fairy saying you need more information.

    ReplyDelete
  5. UnknownOctober 7, 2013 at 7:12 AM

    It was good. You could have used more info. The pictures were really good. The link should have been hyperlinks. The grammar was good. The writing could have been a little better, but it was really good. 17/20

    ReplyDelete
  6. UnknownOctober 7, 2013 at 7:14 AM

    This comment has been removed by the author.

    ReplyDelete
  7. UnknownOctober 7, 2013 at 7:15 AM

    it was confusing i couldn't follow what you were saying. overall:5/20

    ReplyDelete
  8. UnknownOctober 7, 2013 at 7:17 AM

    Your info was confusing and you do not have any hyper links. THe picture were good, but your style of writing is flat. Overall: 9/20

    ReplyDelete
  9. GabbyOctober 7, 2013 at 7:17 AM

    Ok so jack I'm giving you a 9/20 because your info was confusing, you had no hyperlinks (so it looked messy) and it kinda looks like you just copied it. You just need to put things into your own words instead of copying. I'm really sorry, but at least you know what to work on.

    ReplyDelete
  10. UnknownOctober 7, 2013 at 7:19 AM

    ^^^^ What gabby said ^^^^

    ReplyDelete
  11. UnknownOctober 7, 2013 at 7:20 AM

    It would be better if you have more informations. Learn to put hyperlinks. And lay out is confusing to me.. Ill give you B

    ReplyDelete
  12. UnknownOctober 7, 2013 at 7:24 AM

    The blog was confusing and it looks like you copied it from a text book. The links made it look messy. 9/20 sorry.

    ReplyDelete
  13. thekingethanOctober 7, 2013 at 7:50 AM

    10/20 because you didn't hyperlink, sounded like a textbook, it was confusing

    ReplyDelete
  14. EpicRaptorOctober 7, 2013 at 8:01 AM

    you need to learn how to hyperlinks and put the links at the end. Sounded like a textbook. 14/20

    ReplyDelete
  15. UnknownOctober 7, 2013 at 9:40 AM

    not so good you had little information and i dont like how you put the links next to the pics. 6/20

    ReplyDelete

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