What Is the International Space Station?
What Is the International Space Station? Visible from Earth with the naked eye, the International Space Station (ISS) is habitable satellite that serves as a micro...
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How Does a Rocket Engine Work?
How Does a Rocket Engine Work? You can make a simple rocket by filling a toy balloon with air and letting it go. Rockets work on the Newton’s principle that every...
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What Is a Light-year?
What Is a Light-year? Space is so vast that scientists don’t use miles to measure how far stars are away from us. The number of miles would be too large to work...
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Why Does an Ice Cube Float?
Why Does an Ice Cube Float? Ice cube floats because it is lighter than water. When water freezes, it increases its volume (expands) by about one-tenth. When 10 quarts...
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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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