Modelling the Expansion of the Universe

When teaching the space portion of this course, there isn't a lot of labs I can do when I compare with the chemistry, biology, or physics teachers.

However, when I do get the chance to do a lab - I'll jump on it.

Here we are, modelling the expansion of the universe with elastics trying to get something similar to Hubble's constant.  Each paperclip represents a galaxy and when you stretch the elastics in between each galaxy, you measure the change in distance from one chosen home galaxy and the others.

Fig 1: I hope they fixed the crooked rulers...

It's a lab that can be done with my grade 9s.  However, the analysis level and connection to the actual expansion of space might not be up to a level that I would like.

I've had some interesting error analysis questions as well as deep questions that strive for true understanding.  (ie:  improvement of measurement in the above picture - ie:  use of tiles? )  What this actually models and how it holds up to current theories about the universe and where it breaks down - all of these are important aspects of the lab that I hope we extract at some point.

Earth and Space Science - my second year teaching

Second semester has arrived, and that means it's earth and space science time!  This is the second year teaching it, and my goodness, my comfort level with this course has skyrocketed.

It certainly helps that my wife is teaching the same course, and we are learning it at the same time.  On our road trips, we wouldn't listen to music - we would download audiobooks and lectures from Neil Degrasse Tyson and Robert Hazen and get the education we needed in space and earth respectively.  I have read most of Carl Sagan's Cosmos book (thanks to last year's students who bought me that book)  and the textbook that my students use.  I know...my wife and I are both geeks.  But, we both love learning.  Here is the comparison of how I feel from last year compared to this year:

• I can now elaborate on my slides as opposed to just reading.  
• I can answer a good percentage of questions that they have.  (at least thus far)
• The engagement level is much higher, even with a much bigger class of 27. 

It's weird - but I'm changing the way I will teach this.  I understand that the students mostly take this course for space - so I will put all the cosmology stuff at the beginning.  However, with the next 4 strands - I will be spiralling through the curriculum.  I will weave my way starting with a little bit of minerals, to touch upon volcanoes, geologic time in the first spiral.  My second spiral will weave through rocks, more volcanoes, geologic time and and planet formation.  The rest of the spiral organization is laid out with my thought processes here, with each column representing one spiral.

Now that I have tried the spiral curriculum when I taught grade 9 applied math, I know what advantages and disadvantages it has.  I know what content lends itself to each of the linear and spiral curriculum.  

One of the coolest things that I have been emphasizing thus far is the contribution of females to this science. Astronomy and cosmology is a science that we're still learning much about and we certainly don't understand much of it even at this point.  We are still developing tools to study what's way out there.  (Hello gravity waves!)  Females now have more access to education than 200 years ago, and one can see their contributions from Leavitt's discovery between absolute brightness and periodicity between maximum and minimum brightness to today's Lisa Randall's "Dark Matter and the Dinosaurs".  Now that women can touch telescopes and things are opening up for them a little, we will see more and more contributions like Lisa Randall's.  I certainly enjoyed her lecture at the Toronto Reference Library.  

I'll show the Cosmos reboot episode entitled "Sister's of the Sun" by Neil deGrasse Tyson later on this week to show other men and women's contribution to our understanding of space and stars.

My ultimate frisbee team is also asking for more practices and they're getting anxious because they're unfamiliar with the system.  Looks like more 5am wakeups for me!