Today, in science class, April 22nd, 2010, we continued our forum discussion in connection with the planet packet. However, we first focused on a very important event which is happening today, the 40th anniversary of Earth day. Earth day was started in the US in 1970 but the UN celebrates international Earth Day on March 20th/ 21st. On this special day they also ring a peace bell.
In connection with Earth Day, we will also be planting plants tomorrow and take them home as a way to give back to the environment.
In our discussion about Earth day we brought up some important things such as one major problem at the moment: global warming. It is referred to as the extremes in climate which have drastically changed in the past years. The causes of global warming are being discussed and there are many theories; but, Ms. D pointed out that since carbon emissions have increased in the past years there have been extreme changes in weather patterns. If this process continues we may even end up resembling Venus; The hottest planet which melts metal on its surface, which would not be a pleasant thought!
Lastly, we watched videos and a slideshow in connection with Earth Day. The links to the videos are just below:
Photography - http://www.youtube.com/watch?
During class, Ms. D also gave us corn starch Styrofoam which indeed is very edible. (:
- The smallest exosolar planet they have found is Jupiter size
- The 4 spacecrafts with the sole mission of leaving this solar system are called Voyager 1, Voyager 2, Pioneer 10, and Pioneer 11. These all went in different directions in our solar system!
- Further explanation of 3 ways to find Exosolar planets:
1) Radical Velocity Method
-It is Earth based
- They find rays from the Parent star (Star which Exosolar planets orbits around) and measure the wavelength. If this wave length is abnormal or weird they suspect that they have found an Exosolar planet.
-The top of a wavelength is called a crest and the bottom a trough.
2) Astrometry Method
- Looks at the wobbling of a star
- Star wobbles because gravity affects it
3) Transit method
- Most surefire method
- Both Earth and solar system based
- Watches the changing brightness of a star
We also had a very cute visitor from 3rd grade named Alice. She came to observe our astronomy forum class for the last 20 minutes. The class introduced themselves and their planets to Alice while we continued the forum.
Homework & Upcoming events
April 23rd : second blogger comment for the 4th quarter is due!
April 27th at 8 AM: The fifth APOD for this unit any date from 2000-2010 may be used! Also, next week is the last APOD that will be due for science this year!
April 28th : Celestial Body test study session at lunch
April 29th : open note Celestial Body Test
April 30th : third blogger comment due
May 4th or 7th: A friend of Mrs. Sprljan may come in to talk to us about astromomy. He specializes in wormholes and Black holes.
May 11th : Chemistry unit starts
May 14th : Extra credit due. Each picture next to a planet is worth 2 points. The planets which count as extra credit are Saturn, Uranus, Neptune and Pluto. Email these pictures to email@example.com or firstname.lastname@example.org for extra credit. Good luck!
Here are the maps for the extra credit assignment: http://www.phy.hr/~mpozek/planeti/
Hebrew: Ohevet otchem kulam (Love ya guys) and good luck (:
Next scribe is Emma