NASA
Nasa: Imagine the Universe: Active Galaxies and Quasars
Describes quasars as being classified within the category of an active galaxy. A description of the emergence of high-energy. Definitions of key words are provided.gamma-ray quasars as an important component of the gamma-ray sky.
Harvard University
Quasars and Active Galaxies
This site provides information about quasars and active galaxies. Includes a glossary of important terms.
Science Buddies
Science Buddies: Correlation of Coronal Mass Ejections With Solar Sunspot Cycle
Scientists have known for hundreds of years that sunspot activity waxes and wanes over a cycle that lasts approximately 11 years. In the 1970's, scientists discovered that the sun periodically blasts electrified gases into space, in huge...
Harvard University
Harvard University: Eye on the Sky, Feet on the Ground
An ebook filled with information and classroom activities covering several astrological topics such as the Earth's rotation and the solar system. Many tips and teaching tools are available to aid in discovering what the sky has to offer.
Other
Center for Educational Resources: Sky Paths
Lesson activities where students observe and describe the movements of objects in the sky in both daytime and nighttime. They learn how early cultures regarded the skies, and the stories they told about them. Students will be given the...
PBS
Pbs Learning Media: Spin a Spiral Galaxy
This interactive activity from NOVA Online lets you spin a spiral galaxy, including our own Milky Way. It demonstrates that what you can learn from visible light observations of a galaxy is largely determined by the angle from which you...