Comets appear like interlopers in the night sky. For thousands of years, people thought they were harbingers of doom and unholy signs. Even into the 20th century, when it became known that comets were chunks of ice and rock visiting the inner solar system from the colder regions of the solar system, people panicked over the imagined threat of cyanide poisoning from the tail of Halley's Comet. But unless one smacks into our planet, doomsday-style, we can safely enjoy the spectacle.
This view of Comet Hergenrother was imaged by Mike Phillips.