4/30 & 5/1 - 8th Grade Agenda

Learning Objective: Learn about the inner planetsCollect HW: Reading & Notetaking p.241 – 243Video: When we left EarthTextbook Reading: p.552 - 556HW: 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 layers Ph___sphere, the

Ch____sphere and the C_____

• Photosphere: Inner Layer (Generate most of the light)

• Chromosphere: Middle layer (reddish)

• Corona: Outer layer (Looks are a crown)

oto

romo orona

Layers of the Sun

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

pots

Solar Fl____

• Solar Flares are eruptions on the sun

• Releases large amounts of magnetic energy.

• Can cause electrical problems here on Earth

ares

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)