Science wallpaper on telephone / page 55

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Blue contrasts in the form of spirals

Cosmic sky with a scattering of stars

Blue architectural structure

Weapons are war, and war is death

Abstract pattern with stars

The mystery of the galaxy, the beauty of the planets

A beautiful blue galaxy

A ball with geometric shapes on a plane

Artificial intelligence in colors

Nice woman. beautiful background

Nice woman. Beautiful background

Photo of a group of creative people

Planet earth in outer space

Planet Earth in outer space

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Система знаний о закономерностях в развитии природы, общества и мышления, а также отдельная отрасль таких знаний. То, что поучает, даёт опыт, урок (в 4 знач.; разг. ).