Transcript 4/20 & 4/21 - 7th Grade Agenda

4/30 & 5/1 - 8th Grade Agenda
Learning Objective: Learn about the inner
planets
Collect HW: Reading & Notetaking p.241 – 243
Video: When we left Earth
Textbook Reading: p.552 - 556
HW: Reading & Notetaking p.244– 245
Daily Reflection
• Prompt: Write 3 questions about the
Mercury, Venus and Mars.
In what units do we measure
distances around our solar
system ?
• AU (Astronomical Unit)
• 1 AU = Distance between the sun and the
Earth
• 1 AU = 93 Million Miles
In what units do we measure
distances between the stars ?
•
•
•
•
•
Light Year
Light travels about 186,000 miles per second
1 Light Year = 65,000 AU
1 Light Year = 6 Trillion Miles
Closest Star (Alpha Centari) is about 4.3 Light
Years away
How much of the solar system’s
mass is in the sun?
• About 99.8%
• Most of the mass of
the solar system is in
the sun
How does the sun generate it’s
energy?
• Nuclear Fusion
• Hydrogen Atoms join
together to from Helium
• Some of the matter is
converted into energy
• The Sun’s core reaches
about 15 million degrees
Celsius
The sun’s atmosphere has three
oto
layers Ph___sphere,
the
orona
romo
Ch____sphere
and the C_____
• Photosphere: Inner
Layer (Generate most of
the light)
• Chromosphere: Middle
layer (reddish)
• Corona: Outer layer
(Looks are a crown)
Layers of the Sun
pots
Sun S____
• Sunspots look small. But they
are larger than Earth.
• Sunspots are areas of gas on
the sun’s surface that are
cooler than the gases around
them.
• This is why sunspots look
darker than the rest of the
photosphere.
• Sunspots intensifies every 11
years
ares
Solar Fl____
• Solar Flares are
eruptions on the sun
• Releases large
amounts of magnetic
energy.
• Can cause electrical
problems here on
Earth
Features of the sun
• Nuclear Fusion
• Hydrogen Atoms join
together to from Helium
• Some of the matter is
converted into energy
• The Sun’s core reaches
about 15 million degrees
Celsius
Mercury
• Smallest Planet
• Closest to the Sun
• It has almost no
atmospheres
• Surface temperature
is 430C to -170C
Mercury
Venus
• Atmospheric Pressure is
90 X greater than Earth
• Clouds are made of
sulfuric acid
• Atmosphere is carbon
dioxide
• Surface temperature is
460C
Venus
• Surface of Venus. Pictures taken by the
Russian Venera-13 probe in 1982. It
lasted only a couple of hours on the
Venusian surface
Mars
• Atmosphere is 95%
carbon dioxide
• Large amount of liquid
water flowed on the Mar’s
surface in the distant
past.
• There are giant
volcanoes
• Surface temperature is 140C to 20C
Mars Phoenix Lander Landed on
May 25th 2008
Possible Ice on Mars
Photos of Mars from Curiosity
Rover (Landed in 2012)