Physics
An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's

Fourth law
First law
Second law
Third law

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Ultraviolet radiations from Sun burn our retina
Infrared radiations from sun burn our retina
All radiations from sun initiate chemical reactions in eyes
Cosmic rays reach eyes more during the eclipse

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