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Question of the Day:
– Why is it important we know about space and our
galaxy?
Objective: I can explain the nebular theory.
Honors HW: Work on your check off sheet vocab.
Turn in all missing assignments so you can go to
reward day May 11!!!!!
Solar System Questions…
• 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 rotating system of
planets, their satellites, an 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
collectively make up most of the remaining
0.15%.
Inner Planets vs. Outer Planets
Terrestrial planets:
Mercury, Venus, Earth,
Mars
Relatively 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?
Gravity
Gravity – what is it?
- attractive force brining items towards itself
Bigger or smaller equal more gravity?
- _________ objects have more gravity
- Earth much more gravity than humans
Inertia
Inertia – What is it?
- An object in motion will stay in motion; 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
FormationTerrestrial
of the Solar
vs. System
Jovian
• Nebular Theory: the sun and planets formed
from a rotating 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
1. Nebula
2. Nebula Spins
3. Sun Forms
4. Planetesimals Form
5. Planets Form
Review: Put into order
___ Nebula Spins
___ Sun forms
___ Planets form
___ Nebula
___ Planetesimals form
Review: Put into order
_2__ Nebula Spins
_3__ Sun forms
_5__ Planets form
_1__ Nebula
_4__ Planetesimals form
a. Nebula
b. Nebula spins
b. Sun forms
d. Planetesimals form
e. Planets form
Compare and contrast the composition of the
inner and outer planets. Why is this?
Planet Formation 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
times bigger