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Space parade of planets in yellow-green tones

Planet earth view from space

An angry dragon destroying the earth

Dna chain computer 3d graphics

Spaceships are preparing for battle

Evening twilight in blue tones

Saltat with a machine gun in the smoke

Nebula and galaxy in astronomy

Planets light sky mountains stars

Planets light sky Mountains stars

The solar system of planets in the galaxy

Christmas tree balls on blue

Weapons and army: heavy warriors

Weapons and Army: Heavy Warriors

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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. ).