Andrew Fraknoi is chair of the Astronomy Department at Foothill College in Los Altos, California.
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16:38
Up Close With the Lunar Eclipse
The lunar eclipse on Tuesday, April 15, will be visible from all over North and South America.
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12:09
ISON: The Comet of the Century . . . or Is It?
As Comet ISON skirts the sun, it could be destroyed—or emerge, even more spectacular than before.
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16:40
A Journey to the Oort Cloud, Where Comets Are Born
The comet ISON, discovered by two amateur astronomers last year, will zoom past Earth next fall. But where did it come from?