light we can see nothing. Sunlight is by far the most
important source of energy on the earth and our entire
solar system. Without sunlight, no known type of life
could exist on the earth. All plants and animals are
depended on light.
Although we can see
light, we still have many questions about it. What is
it? Can you fill up a bottle with light and use it when
you need some? What is light? Is it a substance? Matter?