Welcome to Science 12/3 Turn in HW & pick up a Ch. 19 Section 2 packet next to the tray. Read the Section Summary on Page 3 and then begin answering the.

Welcome to Science 12/3

• Turn in HW & pick up a Ch. 19 Section 2 packet next to the tray. Read the Section Summary on Page 3 and then begin answering the questions on Page 4.

• Today’s Schedule

• 1. Science News

• 2. Question of the Day

• 3. The Sun

Question of the Day

• What object is the central figure that provides most of the energy and provides the most gravity that maintains the balance and order of the solar system to which the Earth belongs?

• The sun

What caused this?

What caused this?

What caused this?

What do you know about the sun?

The Sun: Our Very Own Star

The Sun• 1 of billions of stars• 99% of the mass of the solar system• Rotates every 27 days• Center of the solar system “heliocentric”• 100% a giant ball of gas• 330,000 times bigger than Earth• 74% hydrogen, 24% helium, 2% other gasses• 27 million degrees F.• If you weighed 100 lbs. on Earth, you would weigh

2,800 lbs. on the sun.

Welcome to Science 12/6

Get out your sun packet and make sure you check the word wall for new words.

• Today’s Schedule

• 1. This week’s schedule

• 2. Question of the Day

• 3. Finish Discussion on The Sun and complete Stormy Sunspot Lab

Question of the DayBrought to you by: Brett Thomas

• In the morning the temperature of the gym was 68 F. In the evening the temperature of the gym was 78 F. Throughout the day there was a wrestling tournament in the gym. What explains the dramatic rise in temperature?

• Thermal Energy: As the activity and attendance in the gym increased so did the temperature.

I. Structure of the Sun

• Like Earth, the sun also has different parts.

• The sun is not solid.• The sun is 100%

gas.• Like Earth, the sun

has convection currents.

II. Energy of the Sun• The sun is 4.6 billion yrs. old.

• How does it burn and stay so hot for so long?

• It is not only burning, but the sun is also shrinking due to gravity.

• The burning and energy created by gravity would only supply enough energy for the sun to last only 45 million years.

• How does the sun continue to shine?

II. Energy of the Sun• Nuclear Power !!!!!!!!!!!!!!!• The sun is also powered

by nuclear fusion.• Nuclear Fusion-

process in which 2 or more nuclei join together (fuse) to form a massive nucleus.

• The result is an enormous amount of energy.

• Nuclear Fusion Animation • Fusion in the Sun!

III. Activity on the Sun’s Surface

• Photosphere is where action takes place on the sun’s surface.

• Sunspots- cooler, dark spots on the sun caused by slowing convection currents

III. Activity on the Sun’s Surface

• Solar Flares- giant storms on the surface of the sun that have temps up to 5 million degrees C.

• Solar flares can interrupt radio signals and affect satellites in orbit.

• X6