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Transparent balls on a purple background

Explosion of a supernova star in the andromeda galaxy

Explosion of a supernova star in the Andromeda galaxy

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

A black hole is a region of space-time

Batman vs superman dawn of justice

Batman vs Superman Dawn of Justice

Two planets on the background of the milky way

TWO PLANETS ON THE BACKGROUND OF THE MILKY WAY

The outer space of fantasy

The big planet at sunset

A beautiful fantasy. beautiful background

A beautiful fantasy. Beautiful background

Windows operating system logo

Windows Operating System logo

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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. ).