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Solar System and Light

Our Sun and Earth, our Moon and the Planets, meteors and comets belong to the «family of the Sun» which we call our «solar system».

Our solar system includes nine planets and their moons. The closest planet to the Sun is Mercury. No other planet receives more light and heat that this one. It is the smallest of the planets. Mercury revolves around the Sun at a higher rate of speed than other planets. Its speed is much higher than theirs.

Jupiter is the largest planet in the solar system. Venus is not as large as Jupiter, but it is the brightest planet in the sky. We see its quiet light in the morning as well as in the evening. When it is in the West it is the first point of light which we see in the evening. We see it best of all on a dark night. The darker night grows the brighter it shines and the better to see it. When Venus appears in the East it is possible to see it in the morning hours as well.

We receive natural light from the Sun, the surface of which is heated to a temperature 10,832 F. But visible light may be radiated by cold as well as by hot bodies.

Substances that transform energy into light without becoming heat, are called luminophores, and the light they radiate – luminescence. There are many substances in nature that are capable of absorbing invisible ultraviolet rays and turning them into visible light. Luminescence can also arise from the energy created by fast moving electric charges. (A. Kovalenko)



Вопросы

  1. Family of the Sun

  2. Our solar system includes ________

  3. What planet is the brightest in the sky?

  4. Where do we receive the natural light from?

  5. Substances that transform energy into light without becoming heat, are called__________, and the light they radiate –____________

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