How Many Stars are in our Solar System????a. Hundredsb. Millionsc. Billions

Explain why you chose the answer you picked.

Copy the Sun Notes in your Practice Section.

One star is inside our Solar System –The Sun

The Sun is :-Medium size-Yellow-Dwarf Star

Diameter= 1,392,000 km

5 billion years old

Distance from the Sun = 1AU◦ AU is Astronomical Unit = 149,600,000 km

Corona –◦ Visible during a total

eclipse appears as a white colored halo

◦ Corona means crown in latin

◦ Corona extends into space for millions of kilometers

◦ Solar winds are millions of streams of electrically charged particles

◦ Visible with only special equipment

◦ Can extend 10-12 times the diameter of the sun

Chromosphere – ◦ The middle layer of the

suns atmosphere◦ It is visible during a total

eclipse◦ The Greek word Chroma

means color◦ Below corona◦ 3,000 km thick◦ Visible only with special

equipment

Photosphere◦ First layer of the Sun’s atmosphere◦ The sun does not have a solid surface, but

instead when you are looking at the sun, you are looking at the photosphere

◦ The photosphere is considered to be the Sun’s surface layer.

◦ Visible by naked eye – The Part We See!◦ 600km thick

Convective Zone◦ Outermost layer of the sun’s interior◦ Hot gas rises and then sinks here◦ The loops formed by sinking cool gas causes

energy to move towards the sun’s surface◦ Convection currents of suns gases◦ 200,000 km thick

Radiative Zone◦ Region of very tightly packed gas where energy

moves mainly in the form of electromagnetic radiation

◦ It can take energy up to 100,000 years to move through the radiation zone.

◦ 300,000 km thick◦ Extremely dense – light takes millions of years to

pass through

Core◦ First layer in the sun’s interior ◦ Enormous amounts of energy are produced here

through nuclear fusion.◦ Nuclear fusion is hydrogen atoms join to make

helium atoms◦ 200,000km thick◦ 15,000,000°C

- Just like the Earth, The Sun spins on its axis- The Sun gives off ultraviolet rays- Suns light takes 8 minutes to reach Earth

- Galileo was the first scientist to explore and observe the sun

- Satellites help us get valuable data from the sun

Sunspots ◦ are cooler areas on the sun – on the photospere◦ Can affect the Earths weather

Solar Flare Giant storms on the suns surface that send huge

electrically charged particles into the Solar System

Prominences◦ an eruption of a flamelike tongue of relatively cool,

high-density gas from the solar chromosphere into the corona where it can be seen during a solar eclipse or by observing strong spectral lines in its emission spectrum.

Solar Flares◦ a brief powerful eruption of particles and intense

electromagnetic radiation from the sun's surface, associated with sunspots and causing disturbances to radio communication on earth

Solar Winds◦ from the sun's corona consisting of a flow of

charged particles, mainly electrons and protons, that interacts with the magnetic field of the earth and other planetary bodies.

Made of Hydrogen that fuses to Helium Gravity pulls the sun into the shape of a

sphere.

Assemble the Layer of the Sun Foldable and place it in the Application Section of your journal.

Why do you think the Earth stays in orbit around the sun?

What do you thin would happen if the Earth was no longer orbiting around the sun?

7 Sentence Summary of what we learned. DO NOT GIVE A LIST OF OUR AGENDA!!!!!

Include questions you still have of the sun.