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The Winter 2010 issue of The Earth Scientist includes a variety of educational resources, ranging from astronomy to glaciers. Check out the other publications and classroom materials in our online store.
A diagram which shows the many types of galaxies and their special names
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Galaxies - Star Cities

When we look up at the night sky, we notice that there are many stars in our sky. Stars must like to live together in star cities - galaxies. Our city of stars is called the Milky Way, and it is home to 100 billion stars, including the Sun. The stars stay together because of the force of gravity. There are as many other galaxies in our universe as there are stars in our Galaxy!

Galaxies come in different shapes and sizes. They can be circular or shaped like an egg (elliptical), or appear as pretty pinwheels (spirals). Some galaxies don't seem to fit into these groups, so they are called irregulars.

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The Fall 2009 issue of The Earth Scientist, which includes articles on student research into building design for earthquakes and a classroom lab on the composition of the Earth’s ancient atmosphere, is available in our online store.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF