Download Ch 29.4 H Nebular Theory.pptx

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Solar System Ques%ons… Ques%on of the Day: –  Why is it important we know about space and our galaxy? Objec%ve: I can explain the nebular theory. •  What makes up our solar system? •  Can you name the planets? •  Can you order them, closest to farthest from the Sun? •  What percent of the solar system’s mass is the planets? A. 50% C. .15% B. 99.85% D. 80% Solar System Answers… •  The sun and a huge rota%ng system of planets, their satellites, and numerous smaller bodies •  Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune •  99.85% of the mass of our solar system is contained within the sun. The planets collec%vely make up most of the remaining 0.15%. Inner Planets vs. Outer Planets Terrestrial planets: Mercury, Venus, Earth, Mars Rela%vely small, rocky & metallic More dense (5x water) Closer to sun, warmer Thin atmosphere Weaker surface gravity Lower escape v ~11km/s Jovian planets: Jupiter, Saturn, Uranus, Neptune Giants, made of gas & ice w/rocky, metallic cores Less dense (1.5 x water) Farther from sun, colder Thick atmosphere Greater surface gravity Higher escape v 21-­‐60 km/s Planets Drawn to Scale The Nebular Theory How did our Solar System form? 1
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Gravity Gravity – what is it? -­‐ afrac%ve force brining items towards itself Bigger or smaller equal more gravity? -­‐ _________ objects have more gravity -­‐ Earth’s gravity > human’s gravity Forma%on of the Solar ystem Terrestrial vs. SJovian Iner%a Iner%a – What is it? -­‐ An object in mo%on will stay in mo%on; an object at rest will stay at rest… More dense or less dense spin faster? -­‐ _____ dense -­‐ ANALOGY: Think about a figure skater, spins faster when brings arms towards body 1. Nebula •  Nebular Theory: the sun and planets formed from a rota%ng disk of dust and gases (a nebula). •  Nebula/Interstellar cloud – large cloud of interstellar gas (mostly hydrogen and helium) and dust that collapses on itself, due to its own gravity, and forms a hot, condensed object that will become a new star 2. Nebula Spins 3. Sun Forms 2
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4. Planetesimals Form 5. Planets Form Review: Put into order Review: Put into order ___ Nebula Spins ___ Sun forms ___ Planets form ___ Nebula ___ Planetesimals form _2__ Nebula Spins _3__ Sun forms _5__ Planets form _1__ Nebula _4__ Planetesimals form a.  Nebula b.  Nebula spins c.  Sun forms d.  Planetesimals form e.  Planets form Compare and contrast the composi%on of the inner and outer planets. Why is this? 3
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Planet Forma%on Temperatures Plot •  Does this help? Our Solar System •  99.85% of the mass of the solar system is in the sun. Sun: 1.9882 x 10^30 kg Earth: 5.9742 X 10^24 kg *REMEMBER: every power is ten %mes bigger 4