How Many Stars Can We See at Night?
How Many Stars Can We See at Night? Have you ever looked up at the night sky and tried to count the stars? The number of visible stars seems infinite. It may surprise...
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Why Does the Road Look Wet on a Hot Summer Day?
Why Does the Road Look Wet on a Hot Summer Day? On a hot summer day, while driving along the highway, you may see something that looks like a pool of water ahead of you...
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What Causes Rain?
What Causes Rain? You know that rain falls from clouds. Water is constantly evaporated from the earth’s surface by the warmth of the sun. The invisible water...
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Why Do We Have Time Zones?
Why Do We Have Time Zones? Time is not same everywhere. When it is noon in New York, for example, it is still 9 a.m. in San Francisco. The sun seems to move across the...
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What Are Shooting Stars?
If you look up at the sky on a clear night, you may see a “shooting star” flash across the sky, but they are not stars. Shooting stars are bits of space...
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