The sun influences our solar system and the Earth's climate. It provides the energy that drives the Earth's climate system through photosynthesis and atmospheric circulation. The sun's energy also drives the water cycle, which is the evaporation, precipitation, and runoff that maintains the Earth's freshwater supply.
However, the sun's activity can also harm the Earth's climate, particularly during increased solar activity. Solar storms and other phenomena can disrupt the Earth's magnetic field and ionosphere, leading to effects such as auroras and disruptions to satellite communications. The sun's variability has also been linked to changes in the Earth's climate over long periods, such as during the Little Ice Age in the 17th century.