Tag Archives: Gases

What is the earth’s atmosphere?

The atmosphere is the great  ocean of air enveloping the earth.  it extends up for hundreds of miles. You and I live at the bottom of a great ocean of air that surrounds the earth and that extends upward for hundreds of miles.  We call it the atmosphere. We could not live without it and …

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Why does a fire smoke?

We’ve all see smoke rising from a bonfire or the chimneys of factories and houses. When a log in a fireplace burns, some of the burning wood is changed into invisible gases.  These hot gases, which consist mostly of water vapor and carbon dioxide.  Are very light.  They rise up the chimney and drift away …

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What are stars made of?

Stars are formed from gigantic masses of hot glowing gases.  Hydrogen and helium are the most common gases in a star.  In the clearest night sky you might see a few thousand stars with unaided eye.  Every bright star is a sun, like our own sun. Scientists tell us that a star is a huge …

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What is a Quasar?

The mysterious quasars (KWAY sahrs) are intensely bright, star like objects on the edge of the universe.  One of the big mysteries about the quasars is what they are.  Not stars and not galaxies (groups of stars), quasars have baffled scientists since they were discovered in the early 1960s. A quasar is many times brighter …

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