The constellations have been known as long as people can remember. A constellation is just a pattern stars appear to make in the sky as we look at them, though most of the stars that we associate as being part of any constellation have no connection to each other. Various ancient peoples have given names to the various constellations and those names still exist today.
Aside from Cancer being the dimmest zodiacal constellation, the planet Mars is in Cancer (as of 4/21/10)
Cancer is most likely to be found in the spring time. Around mid April or May is the best time to view it. At 9:00 pm is when you will get the best view of this constellation.
The constellation closest to Leo is Cancer. Cancer is located to the west of Leo in the night sky.
it is a star of a crab that reprsents cancer
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The Cancer constellation can be found in the Northern Hemisphere between Gemini and Leo. It is best visible in the months of March and April. Look for the faint grouping of stars that resemble a crab to locate Cancer in the night sky.
If you mean the constellation cancer, there is no such thing as a "distance to a constellation". It just doesn't make sense. A constellation is basically a general direction in space.
5 stars are there in cancer
Cancer.
"The Crab"
It is Cancer.
You can find a list of them in the Wikipedia article "Cancer (constellation)", under the section "main stars".