NASA - Top Space Weather Questions (Part 1)

Our NASA solar scientists Holly, Alex and Phil answer some common questions about the sun, space weather, and how they affect the Earth. This is a two-part series.
Part One addresses:

1. What is space weather?
2. What are coronal mass ejections?
3. What are solar flares?
4. What are solar energetic particles?
5. What causes flares and coronal mass ejections?

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