The sun is always active.
It influences the environment around the Earth and other planets, and it also generates changes in space for the entire solar system--something we call "Space Weather."
We feel its effects on Earth in many ways, and once we leave our protective atmosphere, it affects our satellites, robotic missions, and human explorers. The sun's reach goes to the edge of the solar system, and we need to understand how it works. In its study of heliophysics, NASA uses a fleet of satellites to take an unprecedented look at the sun and how it affects us here on Earth.
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