Stars and Galaxies

By Jake Koch-Gallup, Matthew Yorro, Aidan McCaul, Brigitte Bazie, and Laura Lill

Galaxies and stars

A galaxy is massive gravitationally bound system that

consists of stars. It also has stellar remnants in it. A star

is a hot, fiery globe shaped mass of gas. It produces its

own light. The closest star to earth is the Sun. Out of all

the stars in the universe the sun is the most important to

us!

Jake Koch-Gallup

Sizes of galaxies

The smallest galaxy is Wilman 1 which is 120,000

light years away from the Milky way. The biggest

galaxy was the IC 1101. It is 1 billion light years

away. IC 1101 is six million light years in size.

The galaxy sixty times larger then the milky way.

When you look up at night do you wonder how

many stars there are? Well there are about

2,000 stars!Jake Koch-Gallup

Stars And What They Are

• Stars can grow and shrink, these are called variable stars

•Temperature changes the color of stars

•A young star would be 10- 200 million years old and are very hot with a blue color

•To reach the nearest star it would take Alpha Centauri ( about 25 million trillion miles)

•Stars can be different colors like blue, red, yellow, and orange

Matthew Yorro

How Many Stars Are There In Our Galaxy?

•There are about A million stars in our galaxy

•Stars Are Born In Nebulas ( Gas And Dust)

•A Star Is A Ball Of Hot Glowing Gases

•The Brightest Star Is Called Sirus

•Nobody knows how big our galaxy is, but they say its infinite!

Matthew Yorro

Shooting Stars

•A shooting star isn’t a star at all its really a star its bits and pieces of a meteoroid.•They break off of meteoroids and increase in speed to cause fire on the piece. •There falling into earths atmosphere so they catch on fire and take on the look a a star.•They usually end up crashing into earths atmosphere and making a big crater.•The craters are mostly caused because of the meteoroids speed.

Aidan McCaul

Star Sizes

• Well, the biggest star known is the VY Canis Majoris.• It is about 2,100 times larger than the sun.• It would fit about 9,261,000,000 suns in it.• The smallest star known is the OGLE-TR-122B it is 12

solar radii.• That is about 167,ooo km (kilometers).

Aidan McCaul

Constellations are formations (or pictures) made by stars. Greek and Middle Eastern astronomers named the constellations after characters from mythology.

The formations appear at different times of the year. Each season earth can view a different sets of constellations. Also the earth views a different set of constellations on the northern and southern hemispheres. Like in August they have different sets of constellations then in April. One of the most famous myths is called The Clash Of The Titans. Here are some of the famous constellations from this story. Pegasus (winged horse), Hydra (Water Snake), Hydrus, Hercules, and Scorpios (scorpion).

Aidan McCaul

Constellations

Galaxy Names

Galaxies are listed in catalogs. The most in common catalog is New General Catalog, or,

NGC. Galaxy names are identified by letters and numbers. For example, galaxy cluster, JKCS041, a letter and number name, is the farthest galaxy cluster away from Earth. Actually, 10.2 light years away. Some galaxies names are the Enhanced Andromeda, Andromeda Widefield, Whirlpool

galaxy, Andromeda Core, Pinwheel galaxy, Leo Pair, NGC, Galaxy NGC, and of course, the Milky

Way!

Brigitte Bazie

What is the most common type of star?

The most common type of star is the red dwarf star. One example of a red dwarf, Proxima Centauri. Proxima Centauri is the closest star to the sun. It is 4.2 light

years from the sun. Proxima Centauri is about fainter 20,000 times than the sun. The lifetime of Proxima

Centauri is about 1,900 years!

Brigitte Bazie

Our Milky Way

The Milky Way is our galaxy NOT a candy bar! There are tons of stars in our Milky Way but no one knows the exact answer. Scientists predict that there are between 200 and 400 billion stars in our Milky Way. That’s a lot of stars!

Laura Lill

Star Death

Did you know that stars die and can turn into different things after they're dead? Well all of that is true! A star starts to die when their core runs out of hydrogen and then helium. The dead star could become a black hole, a neutron star or a black dwarf depending on how big or small it is. Bigger stars usually have shorter lives and stars that live near the sun have shorter lives to because they burn lots of nuclear fuel.

Laura Lill

SourcesBrigitte Bazie• Hubblesite.org• Encyclopedia.com• usra.edu• Galaxyphoto.com• Wired.com• Iau.org

Aidan McCaul• Astronamy.com• The Night Sky (Chapter 1) By Robin Kerrod Marshall Cavendish Co. Tarry town, New York 1996

Laura Lill• Answers.com

Jake Koch-Gallup• Answers.com• Stars Chapter: The Stars page 5 The Rourke corporation By: Seymours Simon

Matthew Yorro• Answers.com• Stars (Pg. 1-17) The Rourke corporation By: Seymours Simon