Transcript 7.1: The Earth`s Role in our Solar System

7.1: The Earth’s Role in
our Solar System
Science Starter
1. Explain how the Earth moves around
in space
2. If the planet we live on is constantly in
motion, does that mean we are
moving right now? Explain.
3. Why do we experience seasons on
Earth?
4. Do you think other planets experience
seasons? Why or why not?
Agenda
 Science Starter
 Black Holes
 Today’s Notes (15)
 Stations
 Exit Ticket
Black Holes: What Happens?
Neil Degrasse Tyson
• Astrophysicist
• Hosted Show, Cosmos: A Spacetime
Odyssey
• Graduated from Harvard &
Columbia
• Gave lectures on astronomy at the
age of 15
Day 2
Earth’s Role in Space
Lesson Essential Question
How does the Earth
move?
(Rotation, Revolution,
Precession, Nutation)
Notes on the Universe
The universe is made of galaxies
which are made of many stars.
Some stars have planetary systems
similar to our solar system. Earth is
a satellite planet of one particular
star (our sun)
The (whole) Earth moves in 3
ways.
The Earth:
1.Rotates (Rotation)
2.Orbits
3.Revolves (Revolution)
The earth rotates on its
axis.
• Rotates = spins.
• The earth makes 1 full rotation
every 24 hours.
The axis of the
Earth is tilted
at an angle of
23.5 degrees.
The axis
always points
towards the
North Star.
• We have day and night
because of the Earth’s
rotation.
DRAW A PICTURE OF THE
EARTH TILTED ON ITS AXIS…
The Earth also revolves
around the sun in an
elliptical orbit.
The earth makes one full revolution
around the sun every365.25 days.
365 days = 1 year
Kepler’s Three Laws of Planetary
Motion (A Summary)
1. Each planet takes an elliptical path
around the sun
2. Planets travel faster when they are close
to the sun and slower when they are
farther away from the sun
3. The amount of time needed for a planet
to revolve around the sun is proportional
to the planet’s distance from the sun
A
B
C
Precession
 The direction this axis of a planet
is pointing in will change, but the
tilt will not change.
 This will change the stars near
the pole but will not change the
seasons (as long as the angle of
the tilt, 23.5 in the case of Earth,
stays the same)
Nutation
 Nutation happens when the axis of a
planet starts to wobble (do the wobble!)
 The angle of the axis will change during
nutation ½ degree one direction or the
other
 Nutation happens over the course of 18
years
 Nutation is a direct result of the moon (or
moons) of a planet
Stations
• There are 3 stations around the room
A. Reading Station (Groups 1-2)
B. Videos (Groups 3,5,8)
C. Hands on (Groups 4,6,7)
• You will spend 15 minutes at your
designated station. You may work alone
or in groups
• At the end you should be able to answer
the following questions…
Stations
• Questions to answer while you
work:
1. Why does the Earth experience
precession?
2. Why does the Earth experience
nutation?
3. What do nutation and precession
have to do with each other?
Moving to Stations
• You will move to the station depending on the
letter you were given during class
• When Mr. Houtz says go, you will move to your
station quickly and read the directions.
• You will stay at your station and only at your
station
• There are extra materials at the very front if you
are interested
• If you finish early, you should answer the questions
in full sentences in your notebook.
Stations
• Questions to answer while you
work:
1. Why does the Earth experience
precession?
2. Why does the Earth experience
nutation?
3. What do nutation and precession
have to do with each other?
Video
• https://www.youtube.com/watch?v=0qHjtp4cdCA
• https://www.youtube.com/watch?v=Dw4Xhw4q4ec
• https://www.youtube.com/watch?v=qNO-BPzPxPk
• https://www.youtube.com/watch?v=lkWyM-M8o0c
Hands On
• https://www.youtube.com/watch?v=cquvA_
IpEsA
Get back to original
groups, put all notes
away
Progress Reports
– All grades are --/100% on EVERY assignment
– Grades that are blank do not count against
your grade (but they will soon!)
– Grades that are blank with a * next to the
name will never count (excused)
– Grades that are 0 are missing
– Homework is broken down by 100, 85, 70, or
50%
– If you have a dispute, make note on your
progress report and return it to Mr. Houtz
Exit Ticket
Ready?
Questions?
Comments?
Exit Ticket
1. Draw the shape of Earth’s orbit around the
sun.
2. Explain why Earth takes the path you drew
in question #1.
3. What is the angle of the Earth’s tilt on its
axis?
4. Explain what Kepler’s laws tells us.
5. Explain how Earth moves about the solar
system (be sure to use rotate, revolve,
nutation, precession in your response).