# 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.

## A Trip to the Observatory

Have you ever wondered what it would be like to take a trip to an observatory to use the telescope? In February 2006, astronomer Travis Metcalfe was granted 7 nights of observing time on one of the telescopes...more

## MOST - Canada's first space telescope

MOST is Canada's first space telescope. It is the size of a suitcase. It was launched in 2003 on an old missile. Under a treaty the missile had to be taken apart. So they used it for science! MOST has...more

## 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

Did you know that about 200 planets have been found around distant stars? The first planet around a star like our Sun was found in 1995. Since then, a new planet has been found almost every month! The...more

## 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

## The Cosmic Microwave Background Radiation

In the 1960's, a pair of scientists noticed some annoying static (like you hear on the radio) when trying to use a special radio antenna. The strange thing about the noise was that it was coming from every...more

## Carina

The constellation Carina is known as the Keel. A keel is the wooden bottom of old sailing ships. Carina used to be a part of the large constellation called Argo Navis. It was divided up into four different...more

## Cassiopeia

Cassiopeia was the queen of an ancient land. She and her husband, Cepheus, had a daughter named Andromeda. Cassiopeia would always say she was prettier than the sea nymphs. A monster called Cetus was...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information.