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**Measuring Up Lesson 36 pps**

Measuring Up Lesson 36 pps The Sun and Solar System Objective 4 At the end of this lesson you will understand the structure and parts of the solar system TEKS 5.5A Describe some cycles in a simple system 5.6A Identify events and describe changes that occur on a regular basis 5.12D Identify gravity as the force that keeps planets in orbit around the Sun and the moon in orbit around the Earth

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**Vocabulary p. 192 Sun Orbit Solar System The star closest to Earth**

The curved path around an object, such as the path a planet follows around the sun. Solar System The sun, the nine planets, and the many other objects that orbit the sun.

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**Guided Questions 192-193 What objects make up the solar system?**

Planets, moons, asteroids, comets, the sun What is an orbit? Moving around the Sun in curved paths Which planet has the longest orbit? Neptune

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**Guided Instruction p. 193 What makes up the solar system?**

The solar system includes the sun, the eight planets, asteroids, comets, and Pluto What keeps the planets inorbit around the Sun? The force of gravity.

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Guided Instruction p.193 List the eight planets in order from the Sun outward. Mercury Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

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Guided Instruction p. 193 Describe an object in the solar system that orbits and is orbited. Ex: Earth both orbits the Sun and is orbited by the moon. The Sun contains percent of the mass of the entire solar system. How does the mass of the Sun compare to the masses of the planets in the solar system? Ex: The Sun has much more mass than all of the planets combined

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Apply the TEKS p. 194 Planet Day Length Year Length Mercury 58.6 days 88 days Venus 243 days 225 days Earth 24 hours 365days/1 yr Mars 24.5 hours 1.88 years Jupiter 10 hours 11.86 years Saturn 29.46 years Uranus 23.9 hours 84.01 years Neptune 18 hours years Which planet takes the longest to orbit the Sun? Why? Neptune takes the longest at Earth years

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Apply the TEKS p. 194 Planet Day Length Year Length Mercury 58.6 days 88 days Venus 243 days 225 days Earth 24 hours 365days/1 yr Mars 24.5 hours 1.88 years Jupiter 10 hours 11.86 years Saturn 29.46 years Uranus 23.9 hours 84.01 years Neptune 18 hours years Which planets have days that are about as long as a day on Earth? Uranus and Mars

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Apply the TEKS p. 194 Planet Day Length Year Length Mercury 58.6 days 88 days Venus 243 days 225 days Earth 24 hours 365days/1 yr Mars 24.5 hours 1.88 years Jupiter 10 hours 11.86 years Saturn 29.46 years Uranus 23.9 hours 84.01 years Neptune 18 hours years Can a planet’s day be longer than its year? Explain Yes. Venus has a longer day(243 Earth days) than year (225 Earth days)

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Apply the TEKS p. 194 Planet Day Length Year Length Mercury 58.6 days 88 days Venus 243 days 225 days Earth 24 hours 365days/1 yr Mars 24.5 hours 1.88 years Jupiter 10 hours 11.86 years Saturn 29.46 years Uranus 23.9 hours 84.01 years Neptune 18 hours years Is there a relations ship between the length of a planet’s year and the distance of that planet from the Sun? Explain The year length gets longer as distance from the Sun increases. Planets that are farther from the Sun have orbits that are longer

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TAKS Practice p. 178 Link to TAKS Practice

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