Science wallpaper on telephone / page 57

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The shining star in the universe

Space with planets and stones

A planet in blue tones on a background of water

A ball with geometric shapes on a plane

Robot for scientific experiments injections syringes

Planet earth with a view from space

Planet Earth with a view from space

Earth from the planet moon

Nice woman. beautiful background

Nice woman. Beautiful background

Movement of planets under sunlight

Photo of a group of creative people

Planet earth in outer space

Planet Earth in outer space

A hazy sight in outer space

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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. ).