SURPRISE! MOST STARS ARE SINGLE

Astronomers have known since the 1700s that a significant fraction of
stars belong to binary or multiple systems. But what is that fraction?
Given the observed fact that most solar-size and larger stars reside in
binaries, many astronomers have concluded that more than half of our
galaxy's stars belong to multiple-star systems.

But a new study shows that the conventional wisdom is almost certainly
wrong. The problem is that astronomers have neglected to consider our
galaxy's most common stellar denizens: red dwarfs. These low-mass,
low-luminosity stars make up more than 80 percent of all the stars in the
Milky Way....

http://SkyandTelescope.com/news/article_1669_1.asp