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Imagination is the Essence of Discovery

What Is the Brightest Star?

Have you ever looked up at the sky and tried to find the brightest star? You may imagine that the number of stars you can see is countless. But the...

What Is the Milky Way?

There is probably nothing more mysterious and wonderful-looking in the sky than the Milky Way, stretching like a band of jewels from one end of the sky to the other....

What Is a Constellation?

Have you ever looked at the stars and traced out squares, letters, and other familiar figures? In nearly all parts of the world, people of long ago did this and...

Why Are Eclipses so Rare?

When the moon in its journey around the earth passes directly between the earth and the sun, it casts its shadow on the surface of the earth, and an eclipse...

What Is the Earth Made Of?

Man is now preparing to explore the moon and other planets and they still don't know exactly what his own earth is made of! A sort of rough answer to...

Why Do Sunsets Look Red?

A beautiful red sunset, the colors warm and glowing, is one of the loveliest sights we can imagine. And sometimes, when we look at it we might say, "See how...

What Keeps the Sun Shining?

It may be hard for us to believe, but when we look at the stars that shine at night and the sun that shines by day, we are looking at...

Why Is the Solar System the Way It Is?

As far as we know, there is no reason why the solar system is arranged exactly as it is. It might have been arranged differently, just as there are other...

How Big Is the Universe?

It is impossible for the human mind to conceive a true picture of the size of the universe. We not only don't know how big it is, but it is...