1. Our Solar System and Beyond

2.  How many of you have travelled to other countries?  Some distances from Montreal:  New York 534.4 km New York 534.4 km  Los Angeles 3962.2 km Los Angeles 3962.2 km  Kingston, Jamaica 3075.5km Kingston, Jamaica 3075.5km  London, England 5227.2 km London, England 5227.2 km  Tel Aviv, Israel 8783.8 km Tel Aviv, Israel 8783.8 km  Cape Town, South Africa 12766.9 kmCape Town, South Africa 12766.9 km  Beijing, China 10467.2 km Beijing, China 10467.2 km  Sydney, Austrailia 16027.5 km Sydney, Austrailia 16027.5  Circumference of the equator : 40 0755 km

3.  We will be dealing with distances MUCH greater than that!  To get an idea of the scale, here is a video:  https://www.khanacademy.org/science/cosmo logy-and-astronomy/universe-scale-topic/scale- small-large-tutorial/v/scale-of-the-large https://www.khanacademy.org/science/cosmo logy-and-astronomy/universe-scale-topic/scale- small-large-tutorial/v/scale-of-the-large

4.  Turn to page 281 in your textbook.  To measure the distance between objects within our solar system, we use astronomical units (AU).  The AU is calculated as the mean distance between the Earth and the sun.  1 AU = 149 597 870.691 km (or approximately 150 million km)

5. Why is drawing our solar system to the proper scale difficult? Bill Nye knows the answer! https://www.youtube.com/watch?v=97Ob0xR0Ut8

6.  For even greater distances, we use light years (ly)  In space, light travels at 299 792 km per second.  In a year, light travels 9 460 530 000 000 km or approximately 9 500 billion km. (the calculation is on p 282 in your textbook.)

7.  Read pages 281 – 287 in your textbook, as well as section 2.3 on p289-290.  Once complete, do questions 5 to 10 on pages 293 – 294. Hint: use scientific notation for the number calculations. See page 281 for help.