Today is Wednesday, June 5th, 2013

Homework:- Complete rockets (launch is THIS FRIDAY!!!!)- Understand how Newton’s Third Law of Motion

makes YOUR particular rocket work!Warm UP:With your shoulder partner, discuss what you know

about the center of our solar system? Is the sun the only star in the sky? Do you know the names of any other stars in the sky?

Goal for Today

• SWBAT demonstrate an understanding of the characteristic of stars by exploring the sun as an example and looking at examples of other stars.

Only write down the BLUE text…

Date: Wednesday, June 5th, 2013Title: Stars

StarA gigantic ball of very hot gases (hydrogen

and helium) reacting by the process of nuclear fusion that give off electromagnetic

radiation.

Relative Size of Planets and the Sun

Putting Earth in Perspective

Rocky (Terrestrial) Planets (and Pluto) in our Solar System

Terrestrial planets (and Pluto) with gas giants (rings not shown)

All planets in the Solar System, plus Pluto,and the Sun

The Sun in relation to large orange giant stars and Sirius (White Dwarf)

The Sun in relation to Red Supergiant stars Betelgeuse and Antares

Types of Stars

Factors that affect the brightness of a star as seen from Earth:

• Size• Distance from Earth• Temperature

– Red is the coolest (but generally the largest in volume)

– Orange and yellow are slightly hotter– White or blue-white stars are the hottest

The SunA medium-heat (a little on the cooler side) Yellow Star at the

center of our Solar System

Layers of the Sun’s AtmospherePhotosphere – 6,000 K

Chromosphere – 10,000 K

Chromosphere/Corona Transition Region – 30,000 to 500,000 K

Prominence – 10,000 K

Corona – 1,500,000 K

Artist’s Depiction

The Sun’s corona can be seen very well during a Solar Eclipse(NEVER LOOK DIRECTLY AT THE SUN, EVEN DURING AN ECLIPSE,

WITHOUT PROPER PROTECTION!!!)

Sun Spots

Darker spots on the photosphere that are cooler than areas around it

Sun spotsOn a clear day, the sun looks like this

Sun Spots!

Prominences

Loops and fountains of blazing gases that leap out of the chromosphere

Solar Flares

Parts of the chromosphere that erupt like a volcano

Solar Flares interacting with Earth’s magnetic field

The effects of solar flares interactingwith Earth’s magnetic field (auroras) as seen from Earth’s surface and near-Earth orbit

Largest flare every recordedNovember 4, 2003

Closing it up…

• What kind of activity on the surface of the Sun can disrupt Earth’s magnetic field– Solar Flares

• What type of star is our Sun?– Yellow Star

• What are the hottest stars in the sky?– Blue and white stars