Everything Gathers

The NGC 4725 galaxy is a ringed barred spiral with only one arm.

It seems that everything we talk about on Coasmos4Kids is coming together at one point or another. Stars are made of gas and dust that come together. Planets are bits of small rocks and asteroids that come together. Even galaxies are made of stars and systems that come together. Stars are constantly moving through the universe just like everything else. As they move, their gravity affects the neighbor stars. Slowly they came together (billions of years ago) and formed galaxies.

Lots And Lots Of Stars

Galaxies aren't just a few hundred or a thousand stars working together. Some are made up of tens of millions of stars and systems. It is amazing that with all of these pieces, they only tend to form a few shapes. As galaxies spin, they form either spiral or elliptical shapes. Astronomers think that the elliptical galaxies are older than the spiral ones. There are also variations of each type. The Milky Way is currently thought to be a barred-spiral galaxy. That means we have a densely packed stellar bar in the middle of our spiral.

-	Introduction
>	Organization
-	Classes
-	Clusters
-	Constellations
-	Milky Way
	MORE ASTRONOMY TOPICS

Bubbles in the Milky Way (NASA Video)

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Useful Reference Materials

Encyclopedia.com (Hubble's Law):
http://www.encyclopedia.com/topic/Hubbles_law.aspx
Wikipedia:
http://en.wikipedia.org/wiki/Galaxy_formation_and_evolution
Encyclopædia Britannica (Evolution of Galaxies):
http://www.britannica.com/EBchecked/topic/223818/galaxy/68152/Evolution-of-galaxies-and-quasars
University of Arizona (Galaxy Distances):
http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxydist.htm
CalTech:
http://ned.ipac.caltech.edu/level5/Sept01/Bahcall2/frames.html
NASA (Galaxy Evolution):
http://www.nasa.gov/topics/universe/features/galaxy-evol.html
University of Tennessee (Galaxy Evolution):
http://csep10.phys.utk.edu/astr162/lect/galaxies/evolution.html

RELATED LINKS

- Cosmos4Kids: Galaxy Classes
- Chem4Kids: Matter
- Chem4Kids: Astrochemistry
- Chem4Kids: Atoms
- Chem4Kids: Hydrogen
- Chem4Kids: Helium
- Physics4Kids: Gravity
- Physics4Kids: Acceleration
- Physics4Kids: Motion
- Physics4Kids: Magnetic Fields

- NASA: Home Page
- NASA: Kids Home Page
- ESA: Home Page
- ESA: Kids Home Page

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