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How do I Interpret graphs? Characteristics of the planets in the Solar System Although Pluto was discovered in 1930, limited information on the distant planet delayed a realistic understanding of its characteristics. Pluto is now considered as a DWARF PLANET not a planet. Pluto is part of the "Kuiper Belt", an area beyond the immediate solar system with objects made mostly of ice and rock. It was predicted that as many as 50 Pluto-size objects and large may exist in this belt, so when not one, but two objects larger than Pluto were discovered, it was decided to re-define what a planet is, because the alternative would be that we'd need to learn up to 50 new planets.... It's best to demote Pluto than to try to remember that many planets. Set A: Essential Questions 1.What planet has the highest temperature? Why (hottest)? 2.What planet has the lowest temperature? Why (coldest)? 3.What is the boiling point of water in degree Celsius and Fahrenheit? 4.What is the freezing point of water in degree Celsius and Fahrenheit Set B: Essential Questions 1.What planet has the highest density? 2.What planet has the lowest density? 3.What planet could float on water (any planet that has a density below 1 g/cm3 )? 4.What is the density of water? Set C: Essential Questions 1.How many Earths can fit in Jupiter? 2.What is the smallest planet? 3.Which is bigger Uranus or Neptune? 4.What is the second biggest planet? Pluto is now considered a dwarf planet. Set D: Essential Questions 1.What planet has the strongest gravity? Why? 2.Which has stronger gravity Uranus or Neptune? Why? 3.What planet has the second strongest gravity 4.What planet has the weakest gravity? Why? Set E: Essential Questions 1.What planet has the longest day? Why? 2.What planet has the shortest day? Why? 3.How many Earth days are there in one Venus day? Set F: Essential Questions 1.What is the relationship between orbital velocity ( speed of revolving around the sun) and distance from the Sun? The Sun is a medium sized star. HERTZSPRUNG-RUSSEL DIAGRAM Open book to page 729 and study figure 10 Questions: ( Answers Only ) 1. Who devised the HERTZSPRUNG-RUSSEL DIAGRAM? (p.728) 2. What are the two most important characteristics of a star? (p.728) 3. What color of star is the hottest? 4. What is the color of our star? 5. Which is hotter the Sun or Alpha Centauri B? 6. Which is brighter the Sun or Alpha Centauri B? 7. Which is bigger Betelgeuse or Polaris? (based on “Lives of Stars”) 8. Which is hotter Betelgeuse or Polaris? 9. Which is brighter Betelgeuse or Polaris? 10.Which is brighter Sirius A or Sirius B?