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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.

Pulsating Stars

 l = 1 l = 2 l = 3 m = -1 m = 0 m = +1 m = -1 m = 0 m = +1 m = -1 m = 0 m = +1 m = -2 m = -1 m = 0 m = +1 m = +2 m = -2 m = -1 m = 0 m = +1 m = +2 m = -2 m = -1 m = 0 m = +1 m = +2 m = -2 m = -1 m = 0 m = +1 m = +2 m = -2 m = -1 m = 0 m = +1 m = +2 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3 m = -3 m = -2 m = -1 m = 0 m = +1 m = +2 m = +3
Images from Asteroseismology.org
In our galaxy, we see stars pulsate. Gravity makes stars very round. We can describe the pulsations with math. The patterns depend on two numbers. We call them "l" and "m".

"l" changes the number of hot and cool spots. "m" can only be between "-l" and "+l". It changes how the hot and cool spots move around.

Stars are far away. We see brightness changes when "l" is small. Play with "l" and "m" to see the ways stars pulsate.

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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.

A Trip to the Observatory

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MOST - Canada's first space telescope

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Images & Multimedia

Here you will find links to all sorts of pictures, animations, videos, sounds, and interactive multimedia that are on Windows to the Universe Explore collections of images in the Image Galleries. Watch...more

Planets around other Stars

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Black Holes

No one is sure that Black Holes really exist, but most scientists think they do. They are very hard to see, because they are black and so is space. They are black because their gravity is so strong that...more