Cancer

From Slackerpedia Galactica

Cancer is one of the thirteen constellations used in astrology.

Cancer is noted as the home of Praesepe, an open cluster called the "Beehive cluster".

Observation

In Russia, Cancer watches you!

Trivia

Both the constellation and the disease were named by the Greeks because they resemble a Crab. How does the disease resemble a crab? I don't know either. But you can check out Wiki's entry on Cancer History to find out.