Asteroids The total mass of all the asteroids is less than that of the Moon. rocky objects with round or irregular shapes lie in a belt between Mars and Jupiter

Large balls of frozen ice and rock that are only visible when they are close to the sun

Pebble-sized particles that enter Earth’s atmosphere and burn up leaving a streak of light across the sky

My Very Educated Mother Just Served Us Nine Pies

Draw a line across the table between the terrestrial and jovian planets and label.

Which are more dense? Jovianorterrestrial

Which have more moons ? Jovianorterrestrial

Which have longer periods of revolution? Jovianorterrestrial

Which are larger in size on average ? Jovianorterrestrial

Which planet has the longest day?

Which planet has the longest year?

eccentricity website

Which planet has the least perfectly circular orbit?

Which planet has the most perfectly circular orbit?

Ms. Ware Earth Science 10/5/09 W.O.T.D.: Eccentricity: is a measure of how an orbit Deviates from circular. A perfectly circular orbit has an eccentricity of zero; higher numbers indicate more elliptical orbits Do now: If a planet has a mostly oval orbit, Where do you think the planet would be fastest? Why? A B C D Sun

Calculate the eccentricity of the ellipse below: Formula:eccentricity = distance between foci length of major axis

When furthest from Sun When closest to Sun

eccentricity website Area A = Area B = Area C

Explain the difference between the geo- and helio-centric models of the solar system. Earth- centered Sun- centered

Introduction to planet project….

RATIOS and PROPORTIONS REVIEW By: Teachers who care!

RATIOS & PROPORTIONS A ratio is a comparison of two numbers by division. To write ratios, use the word to, a colon, or a fraction bar. EXAMPLE #1: John read 3 books in 4 days. Write the ratio of books to days. Words: 3 to 4Colon: 3:4 Fraction: 3/4

RATIOS & PROPORTIONS A proportion is a statement that two ratios are equal. EXAMPLE#2: Is a proportion? Find the cross products. 30 = 30 TRUE If TRUE, the statement is a proportion.

RATIOS & PROPORTIONS EXAMPLE#3: Is a proportion? Find the cross products. 20 = 21 FALSE If FALSE, the statement is NOT a proportion.

RATIOS & PROPORTIONS EXAMPLE#4: Solve the proportion: Find the cross products. 10 Divide both sides by 10.

RATIOS & PROPORTIONS There are 5 boys and 6 girls in Grant School. 1. What is the ratio of girls to boys using a fraction? 2. What is the ratio of girls to children in Grant School (use a colon)? 6:11 3. What is the ratio of boys to children in Grant School (use words)? 5 to 11

RATIOS & PROPORTIONS Are the following proportions? FALSE – Not a proportion TRUE – this is a proportion

RATIOS & PROPORTIONS Find the missing numbers to make the following proportions. 9 10

If John was 5 ft tall, and Jenny was 6 feet tall how would you make miniature but proportional copies of them… 5ft= 10 inches 6ft = ?? HINT FOR PROJECT!!!!

SCALE DRAWINGS A scale drawing is a drawing of an object with dimensions proportional to those of the actual object. To find lengths from scale drawings, set up and solve proportions.

SCALE DRAWINGS USING PROPORTIONS EXAMPLE#1: ¼ in = 5 ft is a scale for a rock band’s concert stage. A. The scale length of the drum stand is 1 in. What is the actual length of the drum stand? Cross multiply..25 Divide by.25

SCALE DRAWINGS USING PROPORTIONS EXAMPLE#2: ¼ in = 5 ft is a scale for a rock band’s concert stage. B. The actual length of the stage is 60 ft. What is the scale length of the stage? Cross multiply. 5 5 Divide by 5

SCALE DRAWINGS USING PROPORTIONS Given a scale of ½ in = 4 ft, find the actual length for each scale length given..5.5