A celestial event is an astronomical phenomenon that occurs in the sky. An ECLIPSE is an event where the moon passes between the sun and the earth, blocking out the sun's light. A NOVA is a star that suddenly increases in brightness due to a nuclear explosion on its surface. A moonset is when the moon sets below the horizon, and a newmoon is when the moon is not visible in the night sky. A meteor shower is when a number of meteors enter the atmosphere and burn up, creating a spectacular show of light.