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- 1. DISCLAIMERThis Presentation may containCopyrighted Material, DO NOT DISTRIBUTE
- 2. Earth and Space 1.4: Student knows that the planets differ insize, characteristics, and composition and thatthey orbit the sun in our solar system. 1.5: Understands the arrangement of planets inour Solar System.
- 3. Overview of the Solar SystemThe solar system consists of: – the Sun, – the nine planets orbiting the Sun, • Possibility of a tenth planet, currently still under investigation by the Astronomical International Union (AIU) (as of July 05) – satellites of the planets, – asteroids, – comets, – and interplanetary medium1.The Sun is the center of our solarsystem (Heliocentric Model). – developed by Nicolaus Copernicus, a Polish astronomer [1]http://www.mnsu.edu/emuseum/information/solarsystem/solar_system.html
- 4. Understanding Earth and Space• Scientific Notation• Mass vs. Weight• Light Year as a unit of Measurement• Density and Volume• Rotation vs. Revolution• Chemical Composition of Planets• Physical Arrangement of Planets
- 5. Scientific Notation General Form: Where: N = number and x = exponent of 10.Scientific Notation is based on powers of the base number 10. • The use of 10 digits for a numbering system may have arisen from counting to 10 using fingers, putting a mark in the sand and continuing to count to 10 again.
- 6. Why do we use Scientific Notation? • Scientific notation is a way to shorten very large numbers and extremely small ones for better understanding. • Numbers placed in this notation can be used in computations in a much easier manner. • This advantage was more practical before the invention of calculators and their abundance. How?In scientific notation;2,890.0 becomes 2.89 x 103.
- 7. Scientific Notation ProcedureStep 1: Move the decimal place until there is a number between 1 and 10.Step 2: Then add an exponent of ten that tells how many places the decimal place was moved. I can move the decimal in two ways: to the right or to the left, how do I differentiate them? • An exponent of ten with a positive exponent, such as 105, means the decimal was moved to the left. • An exponent of ten with a negative exponent, such as 10-5, means the decimal was moved to the right.
- 8. Example of a very large numberIn scientific notation, 2,890 becomes 2.89 x 103.• Remember that any whole number can be written with a decimal point. • For example: 2,890 = 2,890.0• Now, move the decimal place until there is a number between 1 and 10. – By moving the decimal point to the left in 2,890.0 you will get 2.89• Next, count how many places the decimal point was moved. The decimal had to be moved 3 places to the left in order to change 2,890.0 to 2.89 Therefore; 2,890.0 becomes 2.89 x 103Let’s verify it!You can show that you moved the decimal 3 places to the left by multiplying the number by 103. 2.89 x 103= 2.89 x 10 x 10 x 10 2.89 x 103 = 2,890.0
- 9. Example of a very small numberIn scientific notation, 0.0073 becomes 7.3 x 10-3.• First, move the decimal place until there is a number between 1 and 10. If the decimal is moved to the right in 0.0073 you will get 7.3.• Next, count how many places the decimal point was moved. By moving it three places to the right, 0.0073 changes to 7.3. Therefore; 0.0073 becomes 7.3 x 10-3Let’s verify it!You can show that you moved the decimal point 3 places to the right by multiplying the number by 10-3. 7.3 x 10-3 = 7.3 ÷ 103 0.0073 becomes 7.3 x 10-3
- 10. Mass vs. WeightWhat is the difference between mass and weight? Mass => measure of how much matter an object has. Weight=> measure of how strongly gravity pulls on that matter. Weight = Mass ⋅ Gravity Weight Mass = Gravity
- 11. Difference Between Mass and Weight• Weight is dependent on gravity. – Weight is the force exerted on mass by gravity. – Gravity is a force that pulls us toward the center of the planet, which keeps us from drifting off into space. – Every single object in the universe has gravity. – Weight will change depending on the surface gravity.• Mass is independent of gravity. – Mass is the amount (quantity) of matter in an object. – Mass has the same value everywhere in the universe.
- 12. Mass, Weight, and Gravity• If you find the weight of something on Earth and then take it to the Moon and weigh it again, you will find that it is lighter when it is on the Moon.• This is because the surface gravity is less on the Moon.
- 13. How to Calculate Your Weight in Other Planets• Calculate your weight by multiplying mass by the gravity on the surface of the planet. Weight = Mass x Surface Gravity Then surface gravity is the gravitational force exert on the surface.
- 14. How to Calculate Your Weight on Other Planets• So, if you know your weight on Earth and the surface gravity on Earth you can calculate your mass Mass = Weight on Earth Surface Gravity on Earth
- 15. Chart of Planets and Their Relative Surface GravityPlanet Relative Surface Gravity Relative???Mercury 0.38 To what???Venus 0.91Earth 1.00Mars 0.38Jupiter 2.34Saturn 1.06Uranus 0.92 Relative means there is aNeptune 1.19 comparison within this reference point, aPluto 0.06 case, Earth.
- 16. Example CalculationCristal weighs 100 lbs on Earth. How muchwould she weigh on Pluto?– First, calculate her mass on Earth: Mass = Weight on Earth Surface Gravity on Earth Relative surface gravity of = 100lbs = 100 lbs Earth, as previously shown. 1
- 17. Cristal’s Weight on other Planets• After obtaining the mass, calculate the weight on the other planet using the relative surface gravity of Pluto: Weight = Mass x Relative Surface Gravity Weight = 100lbs x 0.06 = 6 lbsCristal would weigh 6 pounds on Pluto!!!
- 18. Cristal’s Weight on Other Planetshttp://www.exploratorium.edu/ronh/weight/
- 19. What is a Light Year ?• A Light Year is a unit of distance. – It is defined as the distance that light can travel in a year.• Light moves at a velocity of about 300,000 km/sec or 300,000,000 m/sec• Light travels 9,500,000,000,000 km in one year, which is 9.5 x 1012 km. Ex.) The distance to the next nearest big galaxy, the Andromeda Galaxy, is 21 quintillion km. Thats 21,000,000,000,000,000,000 km. This is a very large number and it is hard to write and to interpret. So astronomers use other units of distance.• Eg:) (21,000,000,000,000,000,000 km) = 2.21053 *106 light years
- 20. DENSITY AND VOLUME Each box has the same volume. If each ball has the same mass, which box would weigh more?
- 21. Density and Volume The box that has more balls (box #1) has more mass per unit of volume. This property of matter is called density.What is density?• Density is how heavy something is for its size.• You can measure it by how much matter (mass) divided by how big it is (volume)Density = Mass Volume
- 22. DensityDensity = Mass g Units Volume cm3• The density of a material helps to distinguish it from other materials. SinceThe density of a material helps to distinguish mass is usually expressed in grams and it from other materials. volume in cubic centimeters, density isSince mass is usually expressed in grams expressed in grams/cubic centimeter. and volume in cubic centimeters, density is expressed in grams/cubic centimeter.
- 23. Density Activities • Experiment of a floating egg • http://tiger.coe.missouri.edu/~pgermann/D • Insights • Why is it easier to float at the beach than at the pool?(Or salt.)
- 24. Rotation vs. Revolution• Earth makes a complete counterclockwise rotation (spins on its axis) once in each 24-hour period. This is why the sun appears to rise in the East and set in the West• The Earth revolves counterclockwise around the sun once every 365 1/4 days.
- 25. Size and Characteristics of Planets Rotation Radius Density Planet Mass (kg) Period (km) (g/cm3) (days)1. Sun 1.991 x 1030 695,950 1.410 24.662. Mercury 3.181 x 1023 2,433 5.431 58.823. Venus 4.883 x 1024 6,053 5.256 244.594. Earth 5.979 x 1024 6,371 5.519 1.005. Moon 7.354 x 1022 1,738 3.342 27.406. Mars 6.418 x 1023 3,380 3.907 1.037. Jupiter 1.901 x 1027 69,758 1.337 0.418. Saturn 5.684 x 1026 58,219 0.688 0.439 Uranus 8.682 x 1025 23,470 1.603 0.4510. Neptune 1.027 x 1026 22,716 2.272 0.6611. Pluto 1.08 x 1024 5,700 1.65 6.41 Classroom Questions: Which planet has the most mass? Which planet is the largest? Which planet is the most dense?
- 26. Composition of Planets • Magnetic Fields of Earth and other planets are believed to arise from electrical currents produced in the molten cores. • Chemical reaction of elements produces these electrical currents. 6 Planets Iron Nickel Alloy Core 3 Planets Rock and Ice CoreRocks and Materials Exhibition
- 27. Periodic Table of Elements1A 2A 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B 3A 4A 5A 6A 7A 8A Now were getting to the heart and soul of the way your universe works.
- 28. Periodic TablePeriodic Table is a chart that scientists use togather information about all the elements.Elements are the building blocks of all matter.Up to this point in time we have discovered over100 elements.While there may be more out there to discover, thebasic elements remain the same.• Iron atoms found on Earth are identical to Iron atoms found on meteorites. The Iron atoms on Mars that make the soil red are the same too.Information you can get from the periodic table for aspecific element;• Mass, Number of electrons, protons and neutrons
- 29. Arra ng e me nt of P la n e t shttp://www.physics.hku.hk/~nature/CD/regular_e/lectures/chap06.html
- 30. Arrangement of Planets• Planets “orbit” around the sun• The exact arrangement of the planets depends on the day and time.• The planets move like this because of the gravitational pull of the Sun. Without this force, the planets would move off into space.
- 31. Orbits• The planets do not move in a perfect circle around the sun; the path is actually an ellipse Circle Ellipse
- 32. Orbits• A circle has a constant radius (theradius, r, does not change)•The radius of an ellipse is notconstant (r1 ≠ r2) r r2 r1 Circle Ellipse
- 33. Ellipse• An ellipse can be described as a stretched circle with two center points.• The Sun is always at the center in an orbits path• Not all ellipses have the same “shape”
- 34. Properties of EllipsesIn terms of the diagram shown below, with "x"marking the location of the foci, we have theequation a + b = constantthat defines the ellipse in terms of the distancesa and b.
- 35. Properties of Ellipses The amount of "flattening" of the ellipse is termed the eccentricity. Eccentricity rangesfrom 0 to 1.
- 36. Pluto is Not Always the Ninth Planet!• Ever since 1930, school children have memorized the nine planets in order: Mercury, Venus, Earth, Mars, Jupiter Saturn, Uranus, Neptune, and PIuto.• But between January, 1979 and March, 1999, that order is not correct. Plutos eccentric (ellipse-shaped) orbit brought it inside the orbit of Neptune, making it the eighth planet for two decades.
- 37. A Tenth planet??• On July 29, 2005, Mike Brown (Cal Tech), made the announcement that his group discovered a tenth planet of the solar system.• Temporary name of this object: 2003UB313• The International Astronomical Union (AIU), responsible for classifying planets, has yet to classify 2003UB313 as the tenth planet.
- 38. The Elliptical Orbit Concept• Before Copernicuss time (1473-1542 ), it was believed that we lived in a universe in which the earth was stationary and motionless at the center of several concentric, rotating spheres.• Copernicus theorized that planets revolve around the sun (the heliocentric model) – This theory was considered heresy• Kepler (1571-1630), was a “Copernican” who brought acceptance to the heliocentric concept through three planetary motion laws.
- 39. 1: The Law of Ellipses• All planets move in elliptical orbits, with the sun at one focus.
- 40. 2: The Law of Equal Areas•The line joining the planet to the Sun sweepsout equal areas in equal times as the planet travelsaround the ellipse.
- 41. Kepler’s Laws 2: The Law of Equal Areas• The orbiting planet will speed up when it gets closer to the object at the focus. This is caused by the increased effect of gravity on the orbiting object as it gets closer to what it is orbiting around.
- 42. Kepler’s Laws 3: The Law of HarmoniesThis law shows the relationship for the time required fora planet to move around the Sun and the averagedistance from the Sun.

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