Most scientists think our sun began as an immense cloud of gas and dust. Stars that are growing old often shoot out enormous clouds of gas and dust. The gas and dust are made up of all kinds of...
The black emptiness
Space is---emptiness. It is black because emptiness has no light of its own. It is neither cold nor hot because emptiness has no temperature. And, of course, there is no air or water in space. But...
Is air something?
live without it. Almost every kind of animal and plant in the world must have oxygen or it will die. Only about one-fifth of the air is made up of oxygen. Most of the air---nearly four-fifths of...
Around and around the sun
The earth doesn't just spin---it also moves through space. Right this very moment, the earth is rushing through space at tremendous speed---more than 66,000 miles (106,000 kilometers) an hour. It...
An island in space
We live on an island. An island in space! An island is a piece of land with water all around it. The earth is a giant ball of rock and metal with space all around it. A ball of rock and metal such...
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