Take a deeper look into our solar system and discover exactly what a comet is.
Connect your daily life experiences with specific points in a reading using a Double Entry Diary.
With a period of 76 years, Halley's Comet appears in many historical contexts.
Scientists use a close approach by a comet to learn more about the Sun's magnetic field.
The Voyager 1 spacecraft has left the solar system, the first human-made object to do so.