How Fast Does Light Travel?
How Fast Does Light Travel? Light travels very fast. In just one second, it goes 186,282 miles (229,792 kilometres), and at this speed takes about eight minutes to...
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Why Does My Hair Look Dark When Wet?
Why Does My Hair Look Dark When Wet? When your hair gets wet, the water makes your individual hairs stick close together. The water also forms a thin film on your hair....
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What Is a Black Hole in Space?
One of the strangest mysteries of outer space is a “black hole.” A black hole is a place in space where gravity is very strong as the matter is squeezed into a tiny...
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How Does a Smoke Detector Work?
How Does a Smoke Detector Work? There are two basic kinds of smoke detectors: ionization detectors and photoelectric detectors. A smoke alarm uses one or both methods,...
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What Is the Milky Way?
On a clear night you can see a pale white path of light that stretches across the sky. It is what we call the Milky Way. It is the light from the billions of stars that...
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