NASA's Hubble Space Telescope Was Never Meant to Look at the Sun. Astronomers Tried It Anyway
Briefly

The need for warnings against looking directly at the sun peaks during solar eclipses, as unfiltered sunlight can burn holes in retinas, damaging vision.
Using optical aids like binoculars or telescopes can amplify the sun's brightness, making it hazardous not just for eyes, but also for the instruments themselves.
Read at www.scientificamerican.com
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