Whats Beyond Solving Mysteries In Space

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价格:30.00

isbn号码:9780590327398

City Fireball, a meteorite, pho-

matic cameras.

Meteorites:

Space Invaders

Earth is being invaded from space!

It's happening all the time.

Sometimes you can see the invaders coming to-

ward Earth as fiery sparks streaking across the

sky. Most people call these space invaders "shoot-

ing stars." Scientists call them meteors.

Meteors are pieces of rock or metal. As they

pass through Earth's atmosphere, these chunks

of space matter become white hot and glow in the

night sky.

On any given day, thousands of meteors speed

into our atmosphere. At certain times of the year,

great showers of these objects whiz into our at-

mosphere. Most of these chunks of space matter

are not much bigger than grains of sand. But some

can measure miles across. They are going so fast

that most of them burn up long before they can

reach Earth's surface.