But at night, they pull out their telescopes and scan the starry skies searching for cosmic phenomena. And sometimes these amateur astronomers happen upon discoveries that rock the scientific community. The latest example was just last week, when an amateur from Australia noticed an abnormality near Jupiter that experts lauded as one of the most significant ever by an amateur. While he said that many amateurs have been formally trained in astronomy, others have learned along the way, driven by enthusiasm. Suzanne Gurton, education manager for the San Francisco-based Astronomical Society of the Pacific, said professionals have more technical background to analyze data but amateurs play an important role in the collection of it. Scientists around the world sat up and took notice last week when Anthony Wesley, the amateur Australian astronomer, reported to NASA that he was seeing something unusual in the southern hemisphere of Jupiter.
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MathOverflow is a question and answer site for professional mathematicians. It only takes a minute to sign up. Bell called Fermat the Prince of Amateurs. One hundred years ago Ramanujan amazed the mathematical world. In between were many important amateurs and mathematicians off the beaten path, but what about the last one hundred years?
Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye , binoculars , or telescopes. Even though scientific research may not be their primary goal, some amateur astronomers make contributions in doing citizen science , such as by monitoring variable stars ,  double stars ,  sunspots ,  or occultations of stars by the Moon  or asteroids ,  or by discovering transient astronomical events , such as comets ,  galactic novae  or supernovae in other galaxies. Amateur astronomers do not use the field of astronomy as their primary source of income or support, and usually have no professional degree in astrophysics or advanced academic training in the subject. Most amateurs are hobbyists , while others have a high degree of experience in astronomy and may often assist and work alongside professional astronomers.