(Submitted April 02, 1998)
What percentage of the stars are binary systems?
Somebody once said that "2 out of every 3 stars are in a binary".
Seriously, the fraction is very high, but it's difficult to
be precise, because it's difficult to prove that a certain star is
definitely single. Of the stars nearest to the Sun, about half are
known to be in multiple systems.
for Ask an Astrophysicist