A lightyear is the distance light travels in vacuum in one Julian year. A light-year is equal to 9,460,730,472,580.8 km (about 9.461 Pm) or about 5,878,625,373,183.61 statute miles or about 63,241.077 AU (often approximated to 63,240 AU) or about 0.306 601 394 parsecs.
Rain - and other forms of precipitation - occur when warm moist air cools and condensation occurs. Since warm air can hold more water than cool air, when the warmer air is cooled the moisture condenses to liquid - and it rains. The video and text below explain how rain forms and the different types of rain that we get in the UK.
Clouds give us a clue about what is going on in our atmosphere and how the weather might changeâ¦ in the hours or even days to come. Each type of cloud forms in a different way, and each brings its own kind of weather. Cool Condensation Clouds are water.