Science wallpaper on telephone / page 34

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Curved glowing colored lines on a black background

Dragonfly insect for desktop

Two planets on the background of the milky way

TWO PLANETS ON THE BACKGROUND OF THE MILKY WAY

Space is on your desktop

The big planet at sunset

View of the planet. space objects and bodies

View of the planet. Space objects and bodies

Transparent balls on a purple background

Windows operating system logo

Windows Operating System logo

There are many stairs inside the space box

Earth's amazing space astronomy

Earth's Amazing Space Astronomy

A magical unicorn stands in front of the moon

The secret of the deadly battle portal combat

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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. ).