Space Weather Tracker

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Betelgeuse

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1836
John Herschel notes brightness variations
1920
First star (besides the Sun) to have its angular diameter measured
2019-2020
'Great Dimming' event

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Learn the Science: Read our complete educational breakdown on Stars & Stellar Evolution.Historical Archive: Track past occurrences of this cosmic phenomenon.Live Telemetry: Jump to the real-time Kp index & solar wind command matrix.

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