## Saturday, March 23, 2013

### The Week of March 25, 2013

Don't get Spring fever, yet!  We still have four action-packed days at Ellis until you can relax and enjoy some time off.

In math, we will be finishing up our work with mean, median, and mode by creating box and whisker plots.  I really think you will enjoy this representation of data...they are a lot of fun to make!  Check  out this video and info. sheet below to find out how to do it.

We will have your last math quiz of the term (on box and whisker plots) on Wednesday.  While you will NOT have a journal to complete this week, you will need to complete your Compass Learning math assignment by Thursday.

In science, we will be finishing up our work with stars.  Monday, we will have a lesson on the three types of galaxies:  spiral, elliptical, and irregular.  We will add the following information to your note during our lesson.

Spiral Galaxies
When someone says the word galaxy, most people probablythink of a spiral galaxy. Spiral galaxies, such as the one shownin have a bulge at the center and spiral arms. Thespiral arms are made up of gas, dust, and new stars that haveformed in these denser regions of gas and dust. It is hard to tell what type of galaxy we live in because thegas, dust, and stars keep astronomers from having a good viewof our galaxy. Observing other galaxies and making measurements inside our galaxy, the Milky Way, has led astronomersto think that our solar system is in a spiral galaxy. The sameelements, forces, and energy relationships that occur in theMilky Way appear to exist in other types of galaxies.

Elliptical Galaxies
About one-third of all galaxies are simply massive blobs ofstars. Many look like spheres, and others are more stretchedout. These galaxies are called elliptical galaxies. Elliptical galax-ies usually have very bright centers and very little dust andgas. Elliptical galaxies contain mostly old stars. Because thereis so little free-flowing gas in an elliptical galaxy, few newstars form. Some elliptical galaxies, such as M87, are huge and are called giant elliptical galaxies. Otherelliptical galaxies are much smaller and are called dwarf ellipti-cal galaxies.

Irregular Galaxies
When Hubble first classified galaxies, he had a group of left-overs. He named the leftovers “irregulars.” Irregular galaxiesare galaxies that don’t fit into any other class. As their namesuggests, their shape is irregular. Many of these galaxies, suchas the Large Magellanic Cloud are closecompanions of large spiral galaxies. The large spiral galaxiesmay be distorting the shape of these irregular galaxies.

Here is a copy of the lab/sort that will be found on the science shelf.  Feel free to investigate it sometime this week.

To get ready for your test on Thursday, please review your stars booklet you received last Monday.  Please let me know if you need another copy, as I cannot upload it to the blog because of copyright issues with the text.  Your "Seeing Stars" choice sheet is due Thursday, as well.

Keep in mind that you will not have much worktime on Thursday because of our phys. ed. fieldtrip to Armstrong Atlantic State University.  Don't forget to wear school-appropriate gym wear (with an Ellis or grey t-shirt).  You will also need a packed lunch, if you are not getting school lunch.

Remember that Friday is the first day of Spring Break, so there will be no school.  I hope you have some enjoyable things planned for your downtime.  I'm spending my holiday in Budapest, Hungary!  I'll post pictures for you to check out on the blog.  Classes will resume April 8.

See you Monday,
Mr. Trent