Science wallpaper on telephone / page 40

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Far far away galaxy and stars

Full moon on a black background

The planet saturn. outer space

The planet Saturn. Outer space

A picture of metamorphosis with a falling tile

A picture of Metamorphosis with a falling tile

Electric charge from the button in different directions

Silver robot on a black background

Underwater tunnel at the bottom of the ocean

Purple balls on a dark background

A fiery guitar on a black background

Moon desktop screensaver

Moon Desktop Screensaver

The endless misty space of the galaxy

There are many beautiful stars in the universe

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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. ).