black-hole
Sagittarius A*
How big is Sagittarius A*?
About 4.15 million times the mass of the Sun, packed into a region smaller than Mercury's orbit.
Is Sagittarius A* dangerous to Earth?
No — it is 26,000 light-years away and its gravity does not reach us.
Cosmic Explorer Navigation Matrix
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Learn the Science: Read our complete educational breakdown on Coronal Holes.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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