Science wallpaper on telephone / page 45

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Light from a planet in the galaxy in yellow-black colors

Poster on the space theme in lilac tones

Full moon and black sky

That's how planets appear

The rover explores the surface of mars

The rover explores the surface of Mars

Micro-photography touching the water

Moon and black birds in the night

Teenage mutant ninja turtle on a wall background

Teenage Mutant Ninja turtle on a wall background

Nusaiba reaches for the bear

Mac icon in space on the background of the earth

Mac icon in space on the background of the Earth

Energetic desktop screensaver

The iron warrior is preparing for battle

The Iron Warrior is preparing for battle

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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. ).