Stargazers and photographers are finding open-sky vantage points to capture the rare sight.
Photographer Tomáš Slovinský captured the comet's two-pronged tail in striking detail in Slovakia.
The sun's heat warmed the 3-mile (5 kilometer) ice ball enough to cause it to spray out two tails that stretch millions of miles into space.
The white tail is made of dust and the blue one is made of ionized gas, according to NASA.