SUMMARY: Astronomers with the European Space Agency have watched the entire lifecycle of a solar storm using the SOHO and Cluster spacecraft. SOHO detected a large solar flare on the Sun, and then the resulting coronal mass ejection passed the Earth and the 4 Cluster spacecraft. Scientists have speculated that these ejections change shape as they travel from the Sun to the Earth, but the Cluster spacecraft found just the opposite, that its magnetic field stayed the same for the journey.

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