from the just-in-the-neighborhood dept.
astroengine writes "The sungrazing comet that survived the plunge deep into the solar corona, only to escape after swinging behind the sun last week, has posed for an extraordinary photograph. Space station commander Dan Burbank caught Comet Lovejoy and its impressive tail hanging above the Earth's horizon as it begins its long journey back into deep space."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals