# Physics & Physical Science Demos, Labs, & Projects for High School Teachers

## Archive for the ‘Astronomy’ Category

### Our Solar System to Scale

Posted on: April 18, 2010

Tomorrow the students learn just how big our solar system is and just how small we are.  We will use the attached worksheet to calculate the percent distance from Pluto for the planets in our solar system and our nearest neighbor, Proxima Centauri.

Solar System – Size and Scale

To make this lesson really stick, we first calculate the percentages, then we lay out a long 100 meter tape outside.  Students volunteer to be objects and they get a card with the picture of that object on it.  Now we place them on the scale based on their percentage distance.  The Sun is at the zero point, Mercury being only 1% of the distance to Pluto is at 1 meter.  Earth is at 3 meters, Mars is at 4 meters.  Jupiter jumps to 13 meters from the Sun.  Pluto is at the 100 meter mark.

In addition to the vast distances, I then discuss how big these objects would be at this scale.  The Sun, as huge as it is, is only 2.4 cm or 1 inch in diameter.  The Earth would be 0.2 mm, about the size of the period at the end of a sentence.

We discuss how long it takes to get from the Earth to Mars (a 6 month trip by rocket).  The people who are Earth and Mars are fighting for space on the tape, it’s crowded near the Sun.  After they start to get a sense of scale, I hit them with this.  At this scale, the next closes star,  Proxima Centauri, is 676 km (420 miles) away, or roughly the distance from Philadelphia to Portland, Maine.

### Free Astronomy Resources

Posted on: March 30, 2010

At NSTA I met an earth science/astronomy teacher named Jay.  In one of the lectures Jay attended on the Chandra, there were playing cards showing the steps of stellar evolution.  He told me the cards are free and I found the site and ordered a set of them for my classroom today.  One way the cards were used was to ask as question, like “What are the steps to a star becoming a white dwarf?”  You can then choose a subset of the cards and have the students create the proper order of the star’s evolution.

http://chandra.harvard.edu/edu/formal/stellar_ev/cosmic/

To order the material, the bottom of the page has a link saying “request.”  You must be an educator to order this material, so if you are just a space nut, sorry, find a teacher friend or give up your high paying job to become a poorly paid teacher so that you can get free stuff for your classroom.  There are additional links and request forms for posters, you will find it on the first order page.

Whoever is responsible for the Chandra site has a real clue about education.  There are actual lessons and activities that a teacher can use with little or no modification.  I’m finding this to be a rarity; usually the sites have quick activities or thoughts they post as lessons.  The link to the Chandra Educational site is here:

http://chandra.harvard.edu/edu/formal/index.html

There is an awful lot here, I plan on spending more time digging when I have some reading time.

### What’s New in 2013/2014?

Every year brings a change, this one is no exception.

I will be picking up the sophomore honors Algebra II class to keep them separate from the juniors. This should help accelerate them and put them on a stronger track towards Calculus. Looks like there will be only one section each of Physics and Calculus, but still two of Robotics & Engineering.

Hot topics this year are going to be the Common-Core Standards, Standards-Based Grading (SBG), improving AP Calculus scores, and somehow adding Python, maybe as a club.

### Polls in the sidebar

Just a quick poll to help me understand who is stopping by my blog.