Page 58 - Science Class 6 Times Publication

Natural sources of light

The things which emit light without the help of human beings are
called natural sources of light. These things emit light naturally.
Some of the natural sources of light are explained below:

The sun

The sun is the main source of light for the earth.
The sun also provides us heat. The life on the
earth is not possible without the sunlight. The
sunlight not only makes the objects visible but
also helps plants prepare their food. The food
prepared by plants supports the whole living
world on the earth.
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The light travels very fast. It travels with the speed of 3×10 m/s. It
means that the light travels about 30,00,00,000 metres in one second.
The light from the sun takes about 8 minutes and 20 seconds to reach
the earth.

The moon

The moon is also a natural source of light. It
does not emit light of its own but it re ects the
light of the sun and makes it fall on the earth.
Hence, the moon light is not hot.

Star

The stars are just like our sun. Some of the
stars are bigger than the sun. They emit light
of their own. But, the stars twinkle at night
because they are very far away from us.

Fire y

Firey or glow-worm is a small  ying insect.
It has a glowing substance called luciferin on
its tail. So, it seems glowing at night. The light

from the  rey is not hot. It is not suf cient
enough to make the things visible.

Times' Crucial Science and Environment 54 Book 6