
The Sun
4.60 billion years ago
Selective Blindness
To see the truth of the Sun, we have to stop looking at its light. Look with human eyes and you see the Photosphere: a blindingly bright surface at about 6,000 Kelvin. It washes out everything else.
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To see the truth of the Sun, we have to stop looking at its light. Look with human eyes and you see the Photosphere: a blindingly bright surface at about 6,000 Kelvin. It washes out everything else.
This artifact works by blinding the sensor to that visible glare. The SDO Atmospheric Imaging Assembly uses mirrors coated to reflect only extreme ultraviolet light at exactly 171 Ångströms — invisible to the human eye. By ignoring the surface, the instrument reveals the corona: the Sun's superheated outer atmosphere, a place of violent loops and arches usually invisible to us.






























































