The central idea of "What is a supermoon?" is to explain to readers what a supermoon is, how it occurs, and its significance in astronomy. The article discusses how a supermoon is a full moon that appears larger and brighter than usual due to its proximity to Earth, known as perigee. It also explores the history and terminology of supermoons, as well as their connection to natural phenomena such as tides and lunar eclipses. Ultimately, the central idea is to educate readers on the science behind supermoons and their impact on the night sky.
