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 microgravity laboratory
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Earth
Why Are There Leap Years?
Why Are There Leap Years? To answer this question, you need to remember that a year is measured by the amount of time it takes the earth to
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 w
How Deep Is the Deepest Spot in the Ocean?
How Deep Is the Deepest Spot in the Ocean? Off the island of Guam in the Pacific Ocean is a very deep, crescent-shaped trench called the “
How Is Coal Formed?
How Is Coal Formed? Coal comes from plants that have been buried in the earth so long, they turned hard and black. Millions of years ago, mu