The Hidden Lives of Galaxies NSTA 2001 - Jim Lochner and Gail Rohrbach, NASA

A Star is Born!

The Life Cycles of Stars1Twinkle, Twinkle, Little Star ...

2How I Wonder What You Are ...When you look up into the night sky, what do you see?When you look into the day sky, what so you see?

Shoulder Partners:What is a star?

3Different colorsThe hotter a star is, the faster it burns its life away.

Stars have

Star colorDetermined by surface temperature.

Hottest are blue coolest are red.Stellar Material

Space is filled with the stuff to make stars.6M16 - Eagle Nebula Pillars (from Hubble, http://oposite.stsci.edu/pubinfo/PR/95/44.htmlThese are columns of cool interstellar hydrogen gas and dust that are also incubators for new stars. Dense clouds of molecular hydrogen gas (two atoms of hydrogen in each molecule) and dust that have survived longer than their surroundings in the face of a flood of ultraviolet light from hot, massive newborn stars (off the top edge of the picture).As the pillars themselves are slowly eroded away by the ultraviolet light, small globules of even denser gas buried within the pillars are uncovered. These globules have been dubbed "EGGs." EGGs is an acronym for "Evaporating Gaseous Globules," but it is also a word that describes what these objects are. Forming inside at least some of the EGGs are embryonic stars -- stars that abruptly stop growing when the EGGs are uncovered and they are separated from the larger reservoir of gas from which they were drawing mass. Eventually, the stars themselves emerge from the EGGs as the EGGs themselves succumb to photoevaporation.Stars start from clouds

Clouds provide the gas and dust from which stars form.

But not this kind of dust that you find in your house 7N81 from Hubble Heritage - stellar nursery in SMC. These are massive stars whose stellar winds are hollowing out the nebula. Cooler clouds of molecular H and dust are silhouetted against the nebula. It offers a look at the turbulent conditions accompanying the birth of massive stars. See http://heritage.stsci.edu/public/2000oct5/n81table.html

Another candidate would be the Hubble Heritage image of Hubble-X in NGC 6822 (also a site of formation of massive stars). See http://heritage.stsci.edu/public/2001jan/table.html

Household dust is made up of skin, hair, cloth fibers, plants, spider silk, bits of sand and soil. This image is taken from the collection at http://catalog.cmsp.com/datav3/cg060001.htm

Rather: Irregular Grains of Carbon or Silicon

NEBULA: A dense cloud of gas and dust

The nebula begins to smash due to gravity. The pressure and temperature increase and becomes a PROTOSTARBecomes a ProtostarAND A STAR IS BORN!

E = mc2

This process is known as Nuclear Fusion !

11Protostars grow on the principle that The rich get richer. As the clump grows, the gravitational force it exerts increases, and thus is able to grow more.The equation gives the gravitational force exerted by mass m1 on mass ms. As the mass of m1 increases, the force it exerts increases.New Stars are not quiet !

Gas shooting out from a young star system12

All Types of StarsRecall - Stars have Different colors which indicate different temperatures13

When a star loses its mass during fusion, it gives off energy. A star will expand and becomes a RED GIANT like the SUN. RED GIANTWHITE DRAWF

As the star runs out of fuel it will shrink in size and becomes a White Dwarf

PULSARA PULSAR is a rotating white dwarf that gives off radio wavesSUPER NOVA

At the end of a stars life it explodes. The exploding star can outshine all of the other stars in the galaxy for several days and may leave behind only a crushed core. This is called a SUPER NOVA

Life cycle of a starWhen a star forms it begins its life.When a star runs out of fuel, it dies.

Sun-like StarsMassive StarsSo a star has a life similar to a battery that cannot be recharged. When the battery runs out of energy, it is finished. Our sun will run out of energy and it will be finished too. But this will not happen for another 5 billion years!

18

This diagram follows the life of both large and average stars.

We are now hereLife cycle of our sunThe End of the Line for Large StarsLarge stars burn many chemical elements.Iron is one of these elements.Instead of releasing energy, Iron uses energy.

22Fusion stops at Iron, and star collapses under its own weight.The star contains products of the fusion processes.

A Star is Born Part 2

Pointer stars in the "Big Dipper" lead to Polaris, the North Star.

Whats Your Sign?

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Astrology and Horoscopes ~ http://www.enchantedlearning.com/subjects/astronomy/stars/zodiac.shtml

Using TechnologyAstrology Research Site:http://www.astrology-online.com/persn.htm

My Voice Threadhttp://voicethread.com/#q.b1140076

Zodiac Signs and BirthdaysStudent Use of Embedded technologyCourtney Jones

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